R7 moving mail to folder issue


after the last couple of updates, using firefox, when I grab a message to transfer it in a folder on the side folder tree, as I position the cursor on the folder, the selection doesn’t go there right away there.
You see that begin highlighting in green the folder from the first one on top and you have to wait, seconds, before it highlight the folder you choose to move your email. If you release the email earlier it get transferred in the folder highlighted in that moment, not where the cursor is. If I move the cursor the highlighting bar goes over and then come back.
It is impossible to work like that, please advise how can be fixed.

Thank you


after the last update the issue is solved.

Thank you