Inbox mails are not shown in my eM Client account

I have 2 accounts in eM Client. First is working ok. For second account I’m recreving mail on Gmail and also in eM Client. I see new e-mail messages in inbox of eM Client and I can red it, but in 5 minuts message disapered from my eM Client INBOX. So my inbox folder is always empty and I didn’ delete any messages. Problem is that I didn’t recive today two of messages in my Gmail account, but they was deliverd in eM Client inbox and disaperd fot few minutes. Please help me to solve the problem.