Phantom images (@2x.jpg etc)

Recently i have noticed many ‘phantom images’ appearing in my UPLOADS folder. sometimes they are labelled alphanumeric:

https://www.james-baker.com/news/wp-content/uploads/a778abd71a6bbcf3015683d3ec1ffed1.jpg

and are an exact copy of another image I already have:

https://www.james-baker.com/news/wp-content/uploads/title5_rampage-120×120.jpg

So i am curious why they are made at all?

sometimes, the mystery images list a size-suffix that i do not actually use on my site:

https://www.james-baker.com/news/wp-content/uploads/GG_park_sketches_1-200×200.jpg

I use various ways of deleting them; FileZilla, IMAGE CLEANUP plugin etc, but they are remade overnight and are back in my uploads folder. I also notice, when using the ‘Force Regenerate Thumbnails’ plugin that the 200×200 size is always remade.

My question is: I there any easy way to find out which plugin made these images? Or if they are made by WordPress ITSELF, why is it making images I ALREADY have, and can i force it to use the proper ones?. I would love to get to the bottom of this.