Skipping negatives when converting

I’m on a MAC, with Sonoma 14.1.1
Lightroom Classic 13.0.1
NLP V3.0.2

This has happened a couple of times, and I can use suggestions.

I’m a long-time user as I generally convert from B&W negatives to positives. The most recent time, I imported 187 negatives. Convert them to B&W and sync. Then select all and convert to B&W. When I apply, it appears all the images are converted, but when I look at them, only the first 19 were converted and the other still are negative.

At this point I select a batch and convert again, but still, all the selected images don’t convert. I had to do this 7-8 times to get all converted and it’s getting frustrating doing this.

I never had this issue until somewhat recently as there have been times when I could convert 600-700 at a time without an issue. Any suggestions?