downloading all emails again from server every refresh

hi, a have an mail (pop3) and it downloads mails again and again, i have one email 3times in inbox right now. I want to leave mails on server, but it downloads all emails again every it solution?

in the first place please download and install the latest version of eM Client ( If the problem persists, send us your POP log please. Go to: Tools - Settings - Logging, scroll to the problematic account, check POP3, try to simulate the issue and send us the log using the same window. Thank you.