The first photo is not horizontal. The flower pot tips downward. The brown stripe on the table is not recognizable and the white dot on the left should be removed. Also the flower pot should have been in focus or further away from the subject. The coffe should have been sharper.
The second photo is not sharp and has a noisy sky.
The fourth is not sharp.
The last photo should have had more of the foreground in focus. There is chromatic aberation on the mountain/sky border. The sky has artifacts, noise and too much vibrance (blue).
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You have colour balance problems, focus and composition in all of the photos.
these are really nice... yea I''m not sure why they got rejected as I think they are lovely photos... unique coffee design on top too.. Lately a TON of photos are getting rejected.. perhaps it's a "by the book" moderator that doesn't realize these shots will sell... hard to say... you do fantastic work though so don't let this discourage you...
I bet 85-90% of image rejections are purely for technical reasons. I'm guessing it's that high because so many different things can go wrong, anywhere from light & equipment to pre- and post-production. Whoever said 'photography is simple' was lying. To do it well requires great skill and attention to details.
If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html