Moving an item to the trash in Android TB (IMAP) doesn't seem to actually move it on the server. Webmail still shows it in the inbox. I see it in the trash in A

Moving an item to the trash in Android TB (IMAP) doesn't seem to actually move it on the server. Webmail still shows it in the inbox. I see it in the trash in Android, but it refuses to let me move it out of the trash there, saying, "Cannot copy or move a message that is not synchronized with the server". The synchronize button and restarting don't have an effect. Is this a bug or do I have some misunderstanding about IMAP and a misconfiguration? K-9 deletes as expected.