This one is tough to explain in words so I’ve taken a quick recording:
Seems to happen where two elements are grouped together and the first one is edited, the new value is applied to the second element rather than the first.
Windows 10, Firefox 118.0.1, Balsamiq Cloud version Cloud-1542
File sent but, as I noted in the email, while it was easy to reproduce the behaviour yesterday, things seem to be behaving themselves today and I have not been able to recreate the issue this morning.