Hello Marvs01,
Let's check to see if your settings are set to move items to the trash when they are deleted:
"Set Trash or Archive as your default option
Depending on the type of email account you have, you might see Archive instead of Trash when you try to delete emails. You can edit where your deleted messages go in your Mail settings:
- In the Settings app, tap Mail.
- Tap Accounts.
- Tap your account.
- Tap your account once more.
- Tap Advanced.
- Select Deleted Mailbox or Archive Mailbox to send discarded messages there."
Delete emails on your iPhone or iPad - Apple Support
If that is set correctly, and you're still having trouble, we'd recommend contacting Google for further help since they are the service provider.
Gmail Help
Cheers!