simillar content was found in our collection

Too many items. Show us one full-sized image that was rejected.

Keep in mind that Reviewers give you one bite at the apple per submission. The first refusal reason they see is the box that gets checked, although there may be several more reasons for refusal, such as technical/quality or IP issues.  Occasionally, Reviewers make mistakes and check the wrong refusal box. 

Currently, nobody knows how this refusal gets triggered. You may try to change your asset somehow, change the metadata and resubmit. That may or may not work.

This has been a common issue for a few months. Do a search for similar content to see previous postings. In a nutshell, it is what it is and it appears it's going to stay that way.