Chord Naming oddity? A bug? User error?

I put together a set of guitar chords but could not get a common F7 chord to be named F7? I tried assigning other scales, which will often correct an odd chord name that appears, but In this case no Scale corrected the name including Bb Major. I don’t think I had any other settings in place that would have caused this. I was able to work around this but a user new to music theory would be confused. I’m not sure what’s going on so I thought I’d drop a note about the observation. Thanks.