photos I delete keep showing up in my Photos app

Do you use Albums?

Everything you put in an Album is not the photo, but just a reference.

The original photos are (and stay) in the Photos App.

So if you delete "photos" from an Album they are not gone.

It would be better if you can please re-post with a screenshot, in order to understand the phenomenon better. Images / pictures speak louder than words. Do not provide any personal credentials, such as email id, apple id, IMEI number, Serial Number, Phone number, Order ID, if you are sharing a map ensure your location is not identifiable. Etc.