Can’t save after edit extended Front page sessions in Hestia

Dear staff,
My site is using Hestia and Fox Companion to customize the front page. But unfortunately, when I edit the extended front page session like Features, Clients, the customize page seems to stop updating, and I can’t save the changes. I’m using all the newest version of wordpress, Hestia theme and plugins. Could you help me and find the possible reason for that?
Thank you very much!