diff --git a/src/nostalgia/core/studio/tilesheeteditor-imgui.cpp b/src/nostalgia/core/studio/tilesheeteditor-imgui.cpp
index 89aed6500..89f59bd96 100644
--- a/src/nostalgia/core/studio/tilesheeteditor-imgui.cpp
+++ b/src/nostalgia/core/studio/tilesheeteditor-imgui.cpp
@@ -248,10 +248,12 @@ void TileSheetEditorImGui::SubSheetEditor::draw() noexcept {
 		return;
 	}
 	ImGui::OpenPopup(popupName);
-	ImGui::SetNextWindowSize(ImVec2(235, 125));
+	const auto modSize = m_cols > 0;
+	const auto popupHeight = modSize ? 125.f : 80.f;
+	ImGui::SetNextWindowSize(ImVec2(235, popupHeight));
 	if (ImGui::BeginPopupModal(popupName, &m_show, modalFlags)) {
 		ImGui::InputText("Name", m_name.data(), m_name.cap());
-		if (m_cols != -1) {
+		if (modSize) {
 			ImGui::InputInt("Columns", &m_cols);
 			ImGui::InputInt("Rows", &m_rows);
 		}
diff --git a/src/nostalgia/core/studio/tilesheeteditormodel.hpp b/src/nostalgia/core/studio/tilesheeteditormodel.hpp
index cc0365ce5..c4d35d681 100644
--- a/src/nostalgia/core/studio/tilesheeteditormodel.hpp
+++ b/src/nostalgia/core/studio/tilesheeteditormodel.hpp
@@ -206,7 +206,12 @@ struct UpdateSubSheetCommand: public studio::UndoCommand {
 			sheet.name = m_newName;
 			sheet.columns = m_newCols;
 			sheet.rows = m_newRows;
-			oxLogError(sheet.setPixelCount(m_img->bpp, static_cast<std::size_t>(m_newCols * m_newRows)));
+			oxDebugf("old cols: {}, old rows: {}", sheet.columns, sheet.rows);
+			oxDebugf("new cols: {}, new rows: {}", m_newCols, m_newRows);
+			oxDebugf("bpp: {}", m_img->bpp);
+			oxDebugf("pixel count before: {}", sheet.pixels.size());
+			oxLogError(sheet.setPixelCount(m_img->bpp, static_cast<std::size_t>(PixelsPerTile * m_newCols * m_newRows)));
+			oxDebugf("pixel count after:  {}", sheet.pixels.size());
 		}
 
 		void undo() noexcept final {