Haven’t read any other posts but the OP
In my old house I had an issue with a rogue cat coming in and eating my cats’ food. as soon as I went into the kitchen he would run away. He was a big cat
Getting fed up withe situation I set the catflap to “let in but not out”. Then when I heard the familiar sound of this cat coming in and helping himself to the food I came out to the kitchen and he went to run away like normal. He found he couldn’t get out so he ran upstairs. My plan was to give him a squirt with a water pistol then let him out, thinking this would be enough to scare him away forever
Anyway before I got the chance to do this said big cat came haring down the stars and flew at the cat flap - and that flap opened and he got out
so I think a big cat launched themselves at your flap @anon29812515