Blocked by CORS policy by weebly

Hello,

i hope anyone can help with this please. i ahve a website on weebly and on it i have jascript url from another server that open a booking system that have been working for years but yesterday it just stopped working the booking calender just say loading and i get this error: is the error below anything to do with Cloudflare?

https://www.my-weebly-site.com/page1.html 
:1 Access to XMLHttpRequest at
 'https://my-site-on-apther-server.com/index.php?controller=Front&actio…=2022&month=10&locale=&index=0&session_id=6e7…' 
from origin 'https://www.my-weebly-site.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Do you know about CORS?

no i know nothing about cors, i wanted to know if the error is from Cloudflare and if i can change some settings there?