I had the same problem and just discovered a solution:
Go to Settings >> Accounts&Passwords >> select your email address >> advanced >> “move discarded emails to” >> deleted mailbox.
I had the same problem and just discovered a solution:
Go to Settings >> Accounts&Passwords >> select your email address >> advanced >> “move discarded emails to” >> deleted mailbox.
Go into Settings > Accounts & Passwords > email account > Account > Advanced and see what 'Move Discarded Messages Into' is set to
Swipe option in mail setting