Thunderbird will not stay placed in window

[mikeunderwood]

I use the latest Thunderbird and have Thunderbird fixed to one window/desktop and for some reason it will follow or jump to other desktops that I am using. I have a rule that states executable is Thunderbird.exe move to desktop 9 and it only works some of the time. I am using the latest Dexpot.

Any ideas of things to check?

Thank you,
Mike

[Patrick]

I use the latest Thunderbird and have Thunderbird fixed to one window/desktop and for some reason it will follow or jump to other desktops that I am using.

In which situations does this happen exactly?

[mikeunderwood]

I cannot isolate the when it happens to any one or two things. But after going to the window with Thunderbird in it sometimes not all but sometimes Thunderbird will just follow me to every other window/desktop I go to.