backend different than frontend

i have samE ISSUE as this thread: https://wordpress.org/support/topic/differences-between-backend-and-front-end/

Dear TEAM, kindly note I was trying to add some css to this page, and it did not work. However, i created a new page from scratch: with same blocks but i still have issue with elementor backend and frontend: this is amazing https://prnt.sc/u_UZY7hMWiB2 and exactly what i want but frontend, i am still stucked with this bug error frontend: https://prnt.sc/Wpe54OPyIKFe this just happened today suddenly and i was really confused as i am working on the page and we have tomorrow morning first thing first a GO LIVE for the competition and now unable to fix this. whats happening? i really appreciate your help and support in this. 

The page I need help with: [log in to see the link]