diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 361c63af4d..ab4b0e4e12 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -1552,6 +1552,9 @@ static_assert(COUNT(arm) == LOGICAL_AXES, "AXIS_RELATIVE_MODES must contain " _L
 #if HAS_MESH && HAS_CLASSIC_JERK
   static_assert(DEFAULT_ZJERK > 0.1, "Low DEFAULT_ZJERK values are incompatible with mesh-based leveling.");
 #endif
+#if HAS_MESH && DGUS_LCD_UI_IA_CREALITY && GRID_MAX_POINTS > 25
+  #error "DGUS_LCD_UI IA_CREALITY requires a mesh with no more than 25 points as defined by GRID_MAX_POINTS_X/Y."
+#endif
 
 #if ENABLED(G26_MESH_VALIDATION)
   #if !HAS_EXTRUDERS
diff --git a/Marlin/src/lcd/extui/ia_creality/ia_creality_rts.cpp b/Marlin/src/lcd/extui/ia_creality/ia_creality_rts.cpp
index 3eac438bb1..a64fa2ef20 100644
--- a/Marlin/src/lcd/extui/ia_creality/ia_creality_rts.cpp
+++ b/Marlin/src/lcd/extui/ia_creality/ia_creality_rts.cpp
@@ -674,7 +674,7 @@ void RTS::handleData() {
     case DisplayStandbyBrightness: Checkkey = DisplayStandbyBrightness; break;
     case DisplayStandbySeconds:    Checkkey = DisplayStandbySeconds; break;
     default:
-      if (WITHIN(recdat.addr, AutolevelVal, 4400)) // (int16_t(AutolevelVal) + GRID_MAX_POINTS * 2) = 4400 with 5x5 mesh
+      if (WITHIN(recdat.addr, AutolevelVal, AutolevelVal + 2 * (5 * 5 - 1))) // Assuming 5x5 mesh or smaller
         Checkkey = AutolevelVal;
       else if (WITHIN(recdat.addr, SDFILE_ADDR, SDFILE_ADDR + 10 * (FileNum + 1)))
         Checkkey = Filename;
diff --git a/Marlin/src/lcd/extui/ia_creality/ia_creality_rts.h b/Marlin/src/lcd/extui/ia_creality/ia_creality_rts.h
index 9ec7d7872f..3b467f4d25 100644
--- a/Marlin/src/lcd/extui/ia_creality/ia_creality_rts.h
+++ b/Marlin/src/lcd/extui/ia_creality/ia_creality_rts.h
@@ -279,7 +279,7 @@ enum PROC_COM {
 };
 
 const uint16_t Addrbuf[] = {
-  0x1002, 0x1004, 0x1006, 0x1008, 0x100A, 0x100C,  0x1026, 0x1030, 0x1032, 0x1034, 0x103A,
+  0x1002, 0x1004, 0x1006, 0x1008, 0x100A, 0x100C, 0x1026, 0x1030, 0x1032, 0x1034, 0x103A,
   0x103E, 0x1040, 0x1044, 0x1046, 0x1048, 0x104A, 0x104C, 0x1054, 0x1056, 0x1058,
   0x105C, 0x105E, 0x105F, 0x1088, 0
 };