Hello Jhifi
To narrow this down, could you test the same photo directly at Microsoft Designer on the web rather than opening Designer through the Photos app?
- Upload the original photo directly to Designer.
- Apply one obvious adjustment and crop.
- Select Download and open the downloaded file.
If the web download contains the edits, the problem is likely due to the integrated Edit with Designer experience in Photos. If the downloaded file also reverts to the original, please let us know which file format you selected and whether this happens with every image or only certain photos.
Thank you for your time. Please feel free to let me know if you need any further assistance