I have not submitted these images before, I have submitted them for the first time. Many files are b

You are allowed to submit up to 3 variations of a subject. If you submitted more than three, chances are that you get a refusal for similar assets alredy submitted. A second possibility is that what you have submitted is abundantly present in the database and your asset has not the unique selling point required at that moment.

From reading this text alone, it seems that your application was rejected because a large number of similar assets have been submitted.
When submitting, you need to carefully select the assets you submit, limiting similar assets to around three.
If you submit a large number of assets that are too similar, your application may be blocked.