Java popup trigger in Linux

I have an application in which you can do a right mouse button press and drag (as well as a left press and drag for different operations). However, when running this on linux, it seems that popup menus are triggered by a mousePressed and not a mouseReleased. This is resulting in every time I press the right mouse button to perform a drag, the popup menus are triggered (unlike windows, where it is mouseReleased).

Any thoughts on how to work around this?

thanks.

EDIT: Posting code

Code for popup menu

// this is called from mousePressed and mouseReleased
if (e.isPopupTrigger() && !e.isConsumed()) {
    // show the popup menu
}

This code is what is called on the right mouse press/drag (this is 3rd party code, but it is open source so I can change as needed)

// this is called on all mouse events
if (buttonAction.mouseButton != 0)
{
    // handle the event
}