It is because you don't have a full spritesheet for that NPC.
Look at the default sprites for your actors. All 4 rows x 3 columns are different poses for the same actor. Each row represents a different direction, and when you interact with the event, it turns to face you, so it selects the sprite from the appropriate row depending on where you're standing when you interact with it.
It looks strange on non-character sprites because you don't have the spritesheet formatted the same way. Each row and each column could have a completely different image, and not just a different version of the same sprite. But it doesn't change the behaviour of the event - when you interact with it, it's still going to choose an image from the appropriate row so it turns to face you.
To stop it, for "static" events that aren't using a spritesheet filled with a single character, just check the Direction Fix box.
Social distancing is great, apart from trying to work from home while the guy up the road now has ample time and apparently the only way to fill it is to ride his dirt bike up and down our street all day
I worry for the outsiders who send me emails trying to recruit me for their project, but don't even tell me what their project is or what they want in the first and second emails. This is not how you do it and why I like this site more. It is mandatory that you describe your project in detail in the recruitment section at the least!