Homepage not showing

The homepage of my site: https://www.oliverandal.com/blog does not appear properly. It only shows black screen and a strange little square on the upper middle part. Two days ago it was just fine. Im not sure what caused this so I don’t know how to resolve it. Strangely, all my posts, I can open/access with no problem. Also, no problem in accessing the dashboard. I already changed template just in case this is the problem, but the same problem persist. Hope anyone can help me with these.