Batch editing image frame size in sequence ignores changes on every fourth clip

I'm creating a stop motion video and the photos I've imported were not initially fit to the frame size. I've tried to select all photos and clicked "Set image to Frame Size" and while this works for the majority of the slides, every 4th frame is left unadjusted. The images are able to be individually selected and adjusted, but I'm working with thousands of images and I can't feasibly go through and select the images that aren't co-operating. Each image is set to a duration of 1 frame and the aspect ratio of the sequence has been changed after importing the images to the sequence. I thought it may be an issue with the size of the set of photos I was editing, but I'm still encountering this issue when selecting smaller sets, or manually selecting the problem frames and batch editing those. I still find that the frames remain unedited unless I click on each individually and proceed with the set to frame size function. 

Is there any reason this might be happening or a setting that's causing this? 

Version: v 25.1

Platform and OS: Desktop App Mac OS