How did my rs mem acount switch acounts?

ok so i log into my rs acount and it had like a year or so of mem ik that becasue i renewed it the moth before so i log into it and it says i'm no longer a member so i try a differt mem world says plz suscribe and stuff well i'm think this is stupid but then i log onto my other acount and it log onto a member world and it wasnever a mem i never even played on it acpet maybe once but my mem's name was rabadash99 and the f2p one was rabadash999 i had a virus thing for 2 days before this so i think something some how glitched rs but if u know a way that i can get my mem back and fix this problem but i mean if u fixed that virus u could get free mem which isnt good