I can’t be certain but I think LOTW and Clublog are fairly picky when it comes to callsigns. So when I QSO as 9H5G/C6A, the callsign assigned by the Bahamas authorities, those that have C6A/9H5G in their logs are unlikely to get a QSL.
Here is a recent list of the spots that went out with the wrong call. I wonder how many decided to “correct” my call because I was doing it “wrong”?
The moral of the story is log the call in the QSO and NOT the cluster!