I have received a few reports about bugs in GExperts in Delphi 10.4.1 that do not occur in Delphi 10.4. Here is a GExperts DLL that was compiled with Delphi 10.4.1. Maybe it will solve some of theses problems.
Simply extract the DLL and put it into the GExperts installation directory, replacing the original one.
Let me know on Delphi Praxis whether this fixes the problems.