diff --git a/src/ScreenOptionsMasterPrefs.cpp b/src/ScreenOptionsMasterPrefs.cpp
index 6de9757db9..90d0c59ab5 100644
--- a/src/ScreenOptionsMasterPrefs.cpp
+++ b/src/ScreenOptionsMasterPrefs.cpp
@@ -712,7 +712,7 @@ static void GlobalOffsetSeconds( int &sel, bool ToSel, const ConfOption *pConfOp
 
 static void MachineSyncBias( int &sel, bool ToSel, const ConfOption *pConfOption )
 {
-	constexpr std::array<float, 2> mapping = { 0.0f, 0.009f };
+	constexpr std::array<float, 2> mapping = { 0.0f, -0.009f };
 	MoveMap( sel, pConfOption, ToSel, mapping.data(), mapping.size() );
 }
 
diff --git a/src/SongManager.cpp b/src/SongManager.cpp
index 12134ca710..b89426bcee 100644
--- a/src/SongManager.cpp
+++ b/src/SongManager.cpp
@@ -599,6 +599,7 @@ void SongManager::FreeSongs()
 
 	m_pSongs.clear();
 	m_mapNameToGroup.clear();
+	m_mapSeriesToGroups.clear();
 	m_SongsByDir.clear();
 
 	// also free the songs that have been deleted from disk