You've been uploading several images of Back Blings (for example for Antidote or Ball Bling where you uploaded pictures of the Back Blings with blue, green and purple background). We already have images of these Back Blings with much higher quality - you don't need to upload them again. That's what I mean when I say re-uploading images.
You can simply use the ones that have already been uploaded to the wiki by other users. Images of Back Blings, for example, can be found in the Category:Images - Back Blings.
Although you are using the correct pictures, you are still re-uploading them. In Ice Cube, for example, you used the already existing image File:Ice Cube - Back Bling - Fortnite.png (which is good), but you also uploaded the File:Ice Cube - Back Bling - Fortnite-0.png that isn't used anywhere at all.
EDIT: Please also make sure to always add categories to a page when you create one. All the pages about Back Blings belong into the Category:Back Blings, for example.
Well, if the wiki asks you to choose a picture from your device, don't. Other than that, I honestly don't know how you can upload images by accident in the first place. (Although it does seem to happen surprisingly often - you aren't the first one.)
How exactly are you adding the images to the page? Maybe if we go through that step by step we might find where the error happens.