So I was playing on my main when I saw an ingame message that one of my very old pure accounts logged in and then it logged out in a matter of seconds. I freaked out because literally I never shared this account with anyone and it’s a very low level I am sure noone is interested in hacking. I immediately logged in to it and it showed me that the last time someone logged in to it was 20 days ago which is consistent with the last time I remember opening it and contradicts the ingame message I got that the account logged in today.

I am 100% sure of what I saw and yeah I am not high, just was enjoying mining on my main when that happened. Any idea or theory?