Changing Vendor Removes Product Description, Photos Etc

Good day,

When one of my vendors add a product to the product admin and I change the vendor to a different one, the following aspects of the product page (live website) disappear:

1) Product images

2) Product description

3) short description

4) promo text

5) vendor name on the product page

6) SKU/CODE

Tags, however, seem to work and Related products still appear correctly at the bottom of the page.

Has anyone else faced the same problem?

Did anyone find a solution to this?

TIA.

ideas are welcome