Strategies have a tendency to not be saved. Reccomend u start manually saving them to ur computer every time u think i have a good strategy.
Also when quitting its asking if u wanna save, if u have long sessions i would reccomend quitting and saving, then opening PRT again (after a few hours things usually starts to get slow, at least for me, then i restart PRT). This has helped me save alot of good strategies.