A few years ago, I grabbed a filter out of our warehouse, and it didn’t fit
The part number, dimensions, etc. were all correct, but it wouldn’t screw on at all
The threads certainly looked identical to the old filter, which was the exact same brand. It was Wix, so it wasn’t some cheapo loser brand. I didn’t actually measure the threads, because I didn’t have the luxury of spending so much time on an oil change
near as I can tell, the box was unopened before I got it, and the filter didn’t look like anybody dropped it
I simply grabbed another filter and it installed perfectly
I gave the other filter to the warehouse guys and told them it was defective. They actually labeled it as such, so that they’d “get credit” when they were next restocked
I haven’t run into that very often