"unkown sender" email confirmation

Hi, I just used events manager plugin, and try to book some event. but, the email confirmation which received by both event organizer and event user have a problem.

there is no email name sender, >> https://prntscr.com/2fsr49

I have set up it on email setting page, but it still not work >> https://prntscr.com/2fss6e

thanks

https://www.ads-software.com/plugins/events-manager/