I'm having an error with my website where it's not showing on Google any more. It had been well indexed last week, but now has no pages indexed. No major changes were made for this, but when I use the Googlebot Render in Fetch as Google, it shows just the letter "q". We have tried checking the source, but there is no "q" at line 13.
This is what shows in the "Fetching section":
HTTP/1.1 200 OK
Date: Thu, 05 …