AM 1.17.0-1324 Pro, Samsung S7 Edge. In the last couple of days my Inbox has started listing duplicates of the mails - sometimes all of them, sometimes just one or two. If I delete one of the duplicated mails, the other one is also deleted, but only one appears in the trash folder. I then restore it to the inbox and carry on. It's definitely an AM issue, it doesn't happen with K-9 on the phone or Thunderbird on the PC.
Any settings in Mail, Receiving I should check and possibly change? I have enabled Debug Logging, so that should be available if wanted.