Tuplets won't stick

[tbabcock123]

Check out this thread:

Sticky Tuplets

Selecting a rest (or a note) and then invoking the triplet popover and then entering the notes (shift n and note value) will give the result you’ve described. What you need to do is invoke note input FIRST (shift-n) then, once you have the input caret, invoke the triplet popover and then the ratio (select the desired note value or type the note value into the popover after the ratio). Then, inputting the notes will result in sticky tuplets.

and from the manual:

Inputting tuplets