Hello Reddit, please excuse my formatting I'm on mobile.

Question; Am I paranoid over nothing or is their something I should be worried about?

Context Keys:

E - Old, Grey Cat T - Calico cat that ran away B - White kitten with a black tail

Normally I wouldn't post on here but this is the fourth time something strange has happened and it's left me more then a little creeped out and wanting to vent and maybe get an opinion on the matter.

My family (which is me, my sister, and my mother) moved to a new house about two years ago and the basement downstairs is unfinished, with the laundry room to one side split with a wall and the rest of the basement is supposed to be a sort of play/gaming/TV watching area for my sister and I. The basements always been a creepy area but it's a basement, no one likes basements so I never thought much of it until, well, now.

The first event; It was probably five/six months since we had moved in the the house and I was downstairs watching something when I heard my name from the laundry room. The catch? My mom was working evenings, it was Friday pre-covid so my sister was at a friend's house, so I was alone with no one but my two cats, E and T, to keep me company. Needless to say, I turned the TV off and bolted upstairs.

The second event; This took place maybe a few months after the first event only T had just recently escaped from the new house. We had no luck finding her and I remember being upstairs in the living room when I heard T meowing from downstairs. The problem was that I knew it wasn't just mistaking E's meowing for T's because E was in my moms room, I even went in to check, E was still on my mom's bed and when I went back to the living room the meowing had stopped. I didn't go downstairs to check.

Third event; This one took place maybe a month ago, we got our new kitten, B, in November of last year and she's a rowdy little thing, getting into all the nooks and crannies of things, annoying E every chance she has. One day I was watching them run around each other when E came flying past me from the basement and into the kitchen. I was heading downstairs, to the freezer, I think, when I saw E at the bottom of the stairs. I just sort stared for a moment before I backpeddaled and search for E, where I knew I had just seen her rush past me, and found her in my room. Rushed downstairs and the only one down their was B. creepy.

The fourth and final event happened just recently; I was downstairs again when I heard meowing from the far upper left corner, from where I was sitting, of the basement. The only problem was that I knew my cats were in the laundry room playing with each other, and even though I could hear them, I got up to check. Anyways, I decided that because my mother was home this time I had the ability to check out whatever was happening because this time if something happened I could scream and be heard but I found nothing but scratches in the concrete floor leading under this shelf thing my mum has. Idk if a cat can scratch into a concrete floor but I don't think they can so... If you can prove me wrong, pls do, I'm begging you.

Anyways, bad vibes all around, I've been trying to keep away from the basement at night now and any meowing that comes from the basement is strictly ignored bc idk what's down there but it's not my cats.

If you want me to provide pics of the concrete scratches for like, idk an idea of what may be in my basement let me know and I'll add them in an edit.