The issue seems to be fixed FINALLY I deinstalled every mod, redownloaded RSMP and its dependencies and installed only those. My best guess is that the cause was the version of module manager. I had the problem with
version 4.2.3 (wich i believe is the newest). Waterfall comes bundled with version 4.1.4. No clue why the newest module manager version seems to bug out RSMP. Now i hope the game doesnt break after i reinstall all the other mods