I created a successful series of Fantasy/RPG games which became a MMO at its 9th installment. After developing an expansion and taking it off the market, the entire series disappeared from my game history, so I couldn’t create another sequel! 
My version is deb amd64 1.3.13
Update to 1.3.14
I don’t think i have met with this bug though…
I had problems with that issue as well, except sometimes it’s various different games that aren’t sequels. Maybe because I have Linux and I can’t update to the new version.