Cant edit a page

am new to concrete, and now am maintaining a website built with concrete.
Currently am trying to update a page, but when I click the edit button at the top left, there are no blocks to edit (
I believe its a custom code but am not able to find its editor.
appreciate any input

Version: 8.5.1

I would check the console for errors (right click on the screen and choose “inspect” and see if any errors show up in the console). There might be a javascript error interfering with edit mode.