This may be an issue stemming from how Roblox handles reuploaded assets. Basically every user created asset eg. clothing, game icon, etc that needs to be moderated has what is called a file hash. Read more about an example of file hashing here.
File hashes uniquely identify files and as such when a person reuploads one of your clothing assets, Roblox can see that the hash for the image file that was reuploaded matches the hash for your original work - this is done because Roblox is then able to immediately approve the reuploaded asset without putting it in the queue for review and approval.
When Roblox content deleted a rulebreaking asset it would also remove all associated files from the asset, resulting in the original uploader having their files deleted as well. With game icons what attackers would do is upload a malicious game file but copy a larger game’s icon. When Roblox moderation deleted the game, they also deleted the game icon and since both the attacker’s game and the original game shared the same file, the original game would have it’s icon deleted as well as can be seen here. When you DMCA reuploads of your asset it may also cause the same issue to come up as the file hashes for both your original work and the reuploaded copies are the same and when Roblox deletes the assets that are copied, they may have inadvertently removed access to the images to the buyers of your asset.