Hi there,
Yes, we introduced a new feature that recognizes zipped files: https://www.cgtrader.com/forum/topics/new-feature-recognizing-file-format-types-in-zipped-files
The update is meant to help designers ease the upload process and show their file information without the need for them to rewrite every file format. It's extremely strange that your texture maps showed up as product images though!
I'll contact you in PM so we can take a look and solve this issue ASAP.
Regards,
Eddie, CGTrader