After adding photos to Power Point Photo Album previous photos corrupted

I created a PowerPoint photo album with some photos, edited some pictures ( made some corrections, added texts, cropped), and saved them.

Then I added some more pictures through the edit photo album option and clicked update. After updating the previously edited pictures are corrupted. A few pictures were not added. In the edit window, some pictures are showing properly on the preview but in the slide show not appear properly.

Kindly suggest how to repair the corrupted pictures.