U_2019 LTS, PM_1.9.1p4
I wish I knew how to reproduce that but it's quite recurrent in the Graph View.
You navigate between several FSMs using < > then suddenly, after making any kind of change in the last FSM that belongs to this navigation history, like typing a letter, clicking here or there in the GV, etc., the navigation moves back to the former FSM on its own.
The only way to stop this is to click on another object, then click again on the one that had the FSM that was being edited.
