Hi there J_R_D,
Got it, thanks for letting us know. To confirm, is your iPad fully up-to-date? We want to ensure that it is as sometimes updating iPadOS may help resolve issues.
Another step you can take to try to resolve this is to backup your iPad, then delete the Mail app and then reinstall the Mail app. This will allow you to download a new version of Mail onto your iPad, which may fix this if the issue is within the app itself. If needed, the steps below show how:
"Remove apps
Do any of the following:
- Remove an app from the Home Screen: Touch and hold the app on the Home Screen, tap Remove App, then tap Remove from Home Screen to keep it in App Library, or tap Delete App to delete it from iPad.
- Delete an app from App Library and Home Screen: Touch and hold the app in App Library, tap Delete App, then tap Delete. (See Find your apps in App Library on iPad.)
If you change your mind, you can redownload apps you’ve deleted."
Those steps are from this article: Remove apps from iPad - Apple Support If the issue continues after redownloading the Mail app again, then from there you can contact Apple Support for further assistance. You can reach out with the following link: Contact - Official Apple Support
Best wishes.