I deleted my secondary characters, afterwards i startet a session on my main character and i noticed, that my level and my entire inventory got deleted. The contents of my safehouse-crate where still there, the Challenges i completed where still completed, all missions(main and secondary)where still completed and my safehouses where still unlocked.
I was really far into the game so i lost many good weapons and attachments.
Because the map didnt get reset i cant unlock my weapons anymore.