Titles not visible for Pages and Portfolio items with sidebar navigation

Hi,

I changed to sidebar navigation header but now my pages and portfolio items won’t show their title (also categories and date for the latter). In the meantime I am adding the title manually with a heading, but I would like to resolve it.

Here’s an example: https://fefobouvier.com/portfolio/amanecer-en-las-sierras-de-minas/

Can you help me resolve that issue?

Thank you,