Calendar reminder keeps on coming back

Calendar reminder keeps on coming back. Video–> http://videobam.com/MpdeM

Hello, if you enter a snooze time, you have to hit the Snooze button rather than Dismiss, however it still seems like there might be a sync issue somewhere. Are you using any other devices with this calendar account?

What version of eM Client are you currently using on your computer, can you please check the exact release number in Help > About? What calendar service are you using with eM Client?