[Users] Deleted mail don't go to designated folder

[鄒翼凰 Alexander Thanotos]

Using Claws Mail 3.14.0 in Windows 10 and set a IMAP account

First trial on delete hundreds of mail, eleven of them go to Trash, others
marked as "To be moved"(understandable for IMAP, but don't know why 11 of
them go to Trash directly).

Then unmark the "To be moved" and set "Put deleted messages in" to a folder
inside IMAP called "Deleted Items"

Second trial on delete tens of mail, 3 of them go to "Deleted
Items", others marked as "To be moved", then I decided to Expunge it, the
Expunge is greyed out, as well as "Execute". On occasion, a pop up will say
"Process Mark. Some marks are left. Process them?". Click Yes but the mail
still inside Inbox but are not moved to "Deleted Items" or "Trash".

What should I do to really first delete the mail so the they move to
"Deleted Items" and the I can decide to further delete and expunge the
items?
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