diff --git a/modules/bot_settings.ts b/modules/bot_settings.ts
index 9707453d..367001cd 100644
--- a/modules/bot_settings.ts
+++ b/modules/bot_settings.ts
@@ -248,6 +248,70 @@ function collectValidationIssues(entries: any[], sourceName: string): { errors:
             if (entry.active) errors.push(issue);
             else warnings.push(issue);
         }
+        // Grid capacity check: activeOrders vs Range/Incr (issue #19)
+        // Per-side estimation mirrors createOrderGrid geometry:
+        //   levels on each side grow geometrically from the center,
+        //   gap slots are split around the boundary.
+        if (entry.active && entry.activeOrders && entry.incrementPercent && entry.targetSpreadPercent) {
+            try {
+                const incr = Number(entry.incrementPercent);
+                const spread = Number(entry.targetSpreadPercent);
+                const buy = Number(entry.activeOrders.buy || 0);
+                const sell = Number(entry.activeOrders.sell || 0);
+                if (Number.isFinite(incr) && incr > 0 && Number.isFinite(spread) && spread >= 0 && Number.isFinite(buy) && Number.isFinite(sell)) {
+                    const parseFactor = (v: any): number | null => {
+                        if (typeof v === 'string' && v.trim().toLowerCase().endsWith('x')) {
+                            const n = parseFloat(v);
+                            return Number.isFinite(n) && n > 0 ? n : null;
+                        }
+                        const n = Number(v);
+                        return Number.isFinite(n) && n > 0 ? n : null;
+                    };
+                    const isXFactor = (v: any) => typeof v === 'string' && String(v).trim().toLowerCase().endsWith('x');
+                    const minF = parseFactor(entry.minPrice);
+                    const maxF = parseFactor(entry.maxPrice);
+                    const minIsX = isXFactor(entry.minPrice);
+                    const maxIsX = isXFactor(entry.maxPrice);
+                    if (minF !== null && maxF !== null) {
+                        const step = 1 + incr / 100;
+                        const gapSlots = Math.max(2, Math.ceil(Math.log(1 + spread / 100) / Math.log(step)) - 1);
+                        // Buy side spans from center down to minPrice:
+                        //   x-factor min "1.15x" -> distance log(1.15)
+                        //   absolute min -> distance log(center/min); approximate center
+                        //   by geometric mean of bounds (ratio-based, no price needed).
+                        let buyDistance: number | null = null;
+                        let sellDistance: number | null = null;
+                        if (minIsX && maxIsX) {
+                            buyDistance = Math.log(minF);
+                            sellDistance = Math.log(maxF);
+                        } else if (!minIsX && !maxIsX) {
+                            const center = Math.sqrt(minF * maxF);
+                            buyDistance = Math.log(center / minF);
+                            sellDistance = Math.log(maxF / center);
+                        }
+                        if (buyDistance !== null && sellDistance !== null && buyDistance > 0 && sellDistance > 0) {
+                            const buyCapacity = Math.floor(buyDistance / Math.log(step)) - Math.floor(gapSlots / 2) - 1;
+                            const sellCapacity = Math.floor(sellDistance / Math.log(step)) - Math.ceil(gapSlots / 2) - 1;
+                            const name = entry.name || `<unnamed-${index}>`;
+                            if (sell > sellCapacity) {
+                                warnings.push(
+                                    `Bot[${index}] '${name}' (${sourceName}): activeOrders sell:${sell} exceeds grid capacity — Range [${entry.minPrice}-${entry.maxPrice}] with Incr ${incr}% fits ~${Math.max(0, sellCapacity)} sell orders. ` +
+                                    `After reset the surplus silently stays unfilled (e.g. S:27 showed Active 22/27, Slots 23 sell). ` +
+                                    `Widen maxPrice, lower Incr, or reduce activeOrders.sell.`
+                                );
+                            }
+                            if (buy > buyCapacity) {
+                                warnings.push(
+                                    `Bot[${index}] '${name}' (${sourceName}): activeOrders buy:${buy} exceeds grid capacity — Range [${entry.minPrice}-${entry.maxPrice}] with Incr ${incr}% fits ~${Math.max(0, buyCapacity)} buy orders. ` +
+                                    `After reset the surplus silently stays unfilled. ` +
+                                    `Widen minPrice, lower Incr, or reduce activeOrders.buy.`
+                                );
+                            }
+                        }
+                    }
+                }
+            } catch {}
+        }
     });
 
     // Cross-bot validation: check for duplicate botKeys (sanitized names)