Hello there @Azhar,
I recommend you to search for the multiple topics other users opened about CORS errors to see if one of them applies to your scenario.
If you can not find anything, please fill this form (https://support.monday.com/hc/en-us/requests/new?ticket_form_id=13855862562962) adding as much information as possible to it (such as account ID, board IDs, item IDs, timestamps, query, etc.) so that our team can take a look into it.
Looking forward to hearing from you 
Cheers,
Matias