My emails keep reappearing after I delete them

after months of calling apple, and searching google, I finally found out why my emails keep reappearing. I have an iPad and iPhone 12, I noticed one day while on my iPad looking at my emails that I had to delete a large block of emails and they did not reappear. The main reason I deleted from my ipad was because one genis had asked a question about my devices but it was just a question and nothing was done. So on this same day, I also delete my emails from my iphone, I have no clue why, but today I deleted 600 emails from my ipad because they kept reappearing on my macbook and when I opened the mail app, they were gone. I think it could be a syncing thing but I am not sure. So until I find the answer myself, I will be deleting large blocks from my ipad first.