Strange menus - wrong right-click for wrong application, and over wrong qube

Two strange issues with right-click menus across two different qubes.

1 . I am using Claws mail in a qube. For several minutes, a right click on the Claws inbox (and anywhere else), displayed what looked like a Firefox right-click menu.

I could move the window around, but the right-click menu remained a Firefox one.

I cannot remember if I could activate any elements inside the Claws program at the time (left-click).

I tabbed through several windows (Firefox windows were open too), and the problem now seems to have gone away.

Was Firefox ‘overwriting’ Claws window? What are the implications of that?

2 . Now Claws is displaying a right-click dialog right over this very window I’m writing on, in Firefox in a different qube on a different workspace. It won’t go away.

I opened it myself - its not automatic - but it is persistent. If I go back to Claws in the other qubes and click on another part of the window, it closes.

Insights?

Another similar report is here: