New issue when Printing on vinyl

I’ve been using Permaprint Premium Aquatone Black to print stickers on vinyl for a couple years now. Up until recently, I’ve been getting good results, but had a new issue pop up. When Printing, the ink appears to be even, but when it dries, there are white spots in the print.

I have noticed that a thinner layer of ink seems to work better, so I may try a finer screen to see if that helps. It’s weird because I’ve been using the same vinyl and 230 mesh screens and this didn’t appear until recently. It did seem to start after a recent purchase of a couple gallons, so it’s possible that the two gallons I got may be the issue. Just wondering if anyone has experienced this.