I get the same thing now and then. You may find that the window you opened
is loaded into Multidock even though multidock displays a different window. You then have to click on the correct tab to see the view you just opened.
When I open a PRV window in Multidock
and lock it, then open a 2nd PRV window, the 3rd PRV window I open will replace the 1st PRV window that is not locked (the 2nd one). However, the PRV window that pops open for me to see is the locked window regardless of which one I was working in last or just opened.
In Multidock, unless a tab is locked, that slot will always display the current window from that view that you open.
Incidentally, if I
unlock the 1st window
after opening several other PRVs, any future PRV windows will open in that slot and the rest of the loaded PRVs tabs will remain in the Multidock. It takes some getting used to.
I'm not sure if this is a bug but I am experiencing several other bugs in X3e's PRV and have listed them in the Problems Forum.