upscale is randomly generating new images

Not sure how or why, But today I am randomly getting new images (of same text promp but think with out reference to sytle image) when I upscale.    I have to open new tab and come back.  Done it 2 times today. 

also those 1st generated images are not on the timeline they are replaced by the new ones that where created when I upscaled.     

this is only and 1st day this has happened.  Been using for good month now.