4/4 time signature. Half note on beat three (and four). Go to make a quarter note triplet beginning on beat 1 - when I do so, it takes part of the pitch on beat three and moves it earlier in the bar so it is part of the triplet. The only way I can get what I want is to put in the triplet first - I can’t do it after the pitch on beat three has been entered. The attached shows this: the first measure has what I described, the second measure (fourth line) shows what happens when I attempt the triplet. The measure above is what I get (and want) if I begin with the triplet.
I’m sure this is user error, and not a bug, but I would like to know what that error is!