wordpress theme missing post titles??

Had some probs with my site so contacted hosting site. 500 error was fixed and blog now up and running, but now the titles are missing to posts and the comments bar are at the start of posts instead?

I have manually added titles within 2 posts on the landing page, but please look at other posts to clarify the problem?

The titles and permalinks are fine and present within the admin area.

Ref: https://www.mesotheliomalungs.org