Real Photos (non-AI) Rejected and I'd like to Know Why

Especially the second one is full of artefacts, you see them without even checking at 100%:

Check your pictures at 100% and when you see artefacts, correct them. If you can't correct them, do not submit. Logos need to be edited out (last picture). The exposure and white balance need to be OK.

The similar pictures may have been OK, or the moderator was not doing his job. Both options are probable, but if they were taken with the same camera, I would guess that the second is true. The first buyer will probably ask for a refund for those.

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

The third photo will also need a property release and possibly a model release.

The first one looks underexposed. The second two are poorly focused or lack depth of field when viewed at 100%. Especially the waves, which almost look like stone steps. Possibly the effects of over-upscaling? Also, the logo on the woman's carry bag probably needs to be removed, either for IP infringement or because it could help identify the person holding it. Of course, without seeing the ones that were accepted, it would be difficult to determine the "dividing line."