I haven't been able to nail down the cause or steps to reproduce yet...
I have been noticing since the Merge update that some HUD items reposition themselves. Only slightly, not like they move across the screen or something, but definitely a noticeable shift from the saved location.
I have also had the HUD occasionally attach to the wrong tables. All the items are positioned correctly, but Table 1 has the Table 2 players, Table 2 has Table 3 players, etc.
I'll see if I can reliably reproduce, but I wanted to give you a heads up.