Photos rejected due to "quality issues".

See Photo Dos & Don'ts 

https://helpx.adobe.com/stock/contributor/help/editing-dos-and-dont.html

If desired after purchase, customers can add optional effects to photos. But they can't remove effects once they've been placed there.  You'll sell more images without effects than you will with them.

Hope that helps.

I'm looking at these on my crappy laptop, but did you add some kind of softening effect or glow filter to these? Adobe will generally reject such images if so,.