Thanks for the reports, looks like we’re still having issues with those multiple add puzzles, will try to push a fix for this shortly, but can take those puzzles out of circulation in the meantime, appreciate your help as always!
Regarding 14276 and 14275, the first 4 chords are indeed different, (one set has the pedal D and the other the pedal G), but it is a bit confusing to have these puzzles be so similar.
EDIT: I believe we have this issue resolved, so am putting these puzzles back in rotation