Dig sites are buggy and not working properly with strange figure of 8 patterns. Here is a pic from reddit, and here is one of my digsites.
I have had the "figure of 8" bug on 2 dig sites now - one of which was buggy and I couldn't complete the digsite because I was being pointed to an area that wasn't in the "8" and I couldn't dig there, even though having gone along the full edge of the "8" there was nowhere else to dig and it was clearly pointing into a section that was not in the highlighted area. The second one I managed to complete successfully.
I could randomize the dig sites, but that's annoying and it doesn't really fix the problem because I could just get another figure of 8.
Hopefully there will be a fix with this restart tonight! Or maybe the next maintenance...