diff --git a/src/Etterna/MinaCalc/MinaCalc.cpp b/src/Etterna/MinaCalc/MinaCalc.cpp
index 6f64fe7699..48d760d0b3 100644
--- a/src/Etterna/MinaCalc/MinaCalc.cpp
+++ b/src/Etterna/MinaCalc/MinaCalc.cpp
@@ -512,9 +512,18 @@ Calc::InitializeHands(const std::vector<NoteInfo>& NoteInfo,
 	auto t_keycount = keycount_defined ? keycount : 0u;
 	auto& all_consuming_ulbu = ulbu_collective.at(t_keycount);
 
-	// if debug, force params to load
-	if (debugmode || loadparams)
+	// if debug, force params to load and reset pmods and base diffs
+	if (debugmode || loadparams) {
 		all_consuming_ulbu->load_calc_params_from_disk(true);
+		for (const auto& hand : both_hands) {
+			for (auto& v : pmod_vals.at(hand)) {
+				std::fill(v.begin(), v.end(), 1.F);
+			}
+			for (auto& v : init_base_diff_vals.at(hand)) {
+				std::fill(v.begin(), v.end(), 0.F);
+			}
+		}
+	}
 
 	// reset ulbu patternmod structs
 	// run agnostic patternmod/sequence loop
diff --git a/src/Etterna/MinaCalc/UlbuBase.h b/src/Etterna/MinaCalc/UlbuBase.h
index eeff33f2f6..098a249e61 100644
--- a/src/Etterna/MinaCalc/UlbuBase.h
+++ b/src/Etterna/MinaCalc/UlbuBase.h
@@ -58,6 +58,8 @@ struct Bazoinkazoink
 		return pmods;
 	}
 
+	/// these are the base diffs which actually must be reset
+	/// between calc runs or else things break
 	void reset_base_diffs()
 	{
 		for (auto& hand : both_hands) {