Missing post titles

Hello everyone!
I just encountered an issue in which all my post titles had dissapeared.
Last thing I did was updating some plugins that I’ve deactivated to check if those were the problem. No change.
If I’m switching themes, titles will show, but in my current theme (Typegrid) – titles are missing.
No change made in code. I am using Yoast SEO and WP Super Cache, if this info helps.
If I view the page source, titles appear in <h1> tags, as before. Just not displayed on the frontend.

Any suggestion will help. Thank you for your time!