Global menu showing menu options of last closed application. I executed robo3t bin file after extracing archive, through Alt+F2 command. Even after closing the application, mate global menu showing menubar options of robo3t. After onward same thing happening for every application.
Confirmed, i have this issue too, but i think we will not find a way to solve that.
Applications we are running are responsible to refresh the Appmenu layout or to free it once closed / focused out. Many applications are not designed to work like this, that makes them incompatible with appmenus ( I have copyq like this ).
The best idea is to ignore it, click the desktop in order caja to take the appmenu or, to run your incompatible app in special environment variables ignoring appmenu.
If you want to help improving it, you can report a bug for your application.