Launcher wiped out all modded installations

I open the minecraft launcher, i choose my installation to play on (forge 1.16.4), it says "ooh there are no player sfety features, bad for you", i click do not show again, then i hit play. Upon the Game having loaded, i quickly realise, that i set my RAM to high and the Computer makes all of the loud fan noises. I close the game again, to modify the Ram, so i hit "Installations", then I see all of my Forge versions have been deleted! (1.12.2 ; 1.16.4) I am just going to reinstall the Forge now.