Images displaying third-party ownership or branding not deleted - Reef Control

According to the image guide (https://help.imdb.com/article/contribution/images-videos/image-guidelines/G27LPBQZA7EAZGJW?ref_=helpms_helpart_inline#) "Images displaying third-party ownership or branding, such as watermarks." are not allowed.* For that reason, I tried, on two occasions, to delete these photos from Reef Doctors: https://www.imdb.com/title/tt2122080/mediaviewer/rm2816231936/ https://www.imdb.com/title/tt2122080/mediaviewer/rm215763456/ https://www.imdb.com/title/tt2122080/mediaviewer/rm3402058240/ but my contributions were declined. Was this in error or does IMDb have a different idea of third-party ownership and/or branding than I do? These are the submissions numbers: #250718-110549-083502 #250718-110602-748702 #250718-110614-077202 #250729-192058-451802 #250729-192123-872202 #250729-192132-393602 *all pictures had a watermark from German broadcasting company ZDF, while Reef Doctors is an Australian show, a fact I pointed out in all contributions.