OK POP3 so neither Drafts nor Sent gets synced
Good to know, kind of narrows down where it could be in our code.
Although it is really hard to try and fix without a scenario to reproduce.
Can you please try this:
- Long press on the account
- Options and folders
- Folders
I understand it's POP3

so that screen will only list the Inbox - but please do this anyway.
There is code on this screen to recalculate / update per-folder message counts (including Drafts, Sent, Deleted) and maybe the Draft folder's will reset to the right value (0).
( as for fixing the underlying cause - like I said really hard to do without a way to reproduce, but we'll file a bug so we can track it )