[resend from correct email]
F38, tb 115.3.2 (64-bit)
The server is configured as pop3 with the option to leave the messages on the server.
After clicking "Get Messages" I often get no reaction for a while, and click again in a few seconds. In this case, after the new messages are downloaded, a second download starts and the same messages are fetched again.
Normally, only new messages are downloaded in this situation (so none on a second download), as it should be.
If I download from another client then I will get these messages again, which is OK as each client should know what it already has.
I have one "main" client which downloads messages, removing them from the server. When away from the main server, I often collect messages using other clients, leaving the messages on the server. This is when the problem shows.