PNG Sequence output changed frame size mid-process on multiple jobs

I used Media Encoder 23.2 via Premiere Pro 23.1 on Win11 to create a series of PNG sequences from a couple of videos. The sequences were put into separate directories. After the processing was done, I found that in about 25% of cases, the outputed PNG files had switched to a different frame size at some point while processing. It's clear from the file dates/times that it happened while it was processing the whole sequence.

How could this happen?

It "acts" as if when I had PP adds a new job row to ME, the new job's frame size causes the current "in progress" job to switch frame sizes, as if the frame size if a single global variable. This is very time wasting and I cannot believe a bug this basic is present.