Polylang plugin doesn’t work with my theme builder

Hi. I’m using Massive Theme Builder, and massive dynamic pro as my theme. I realized as I activate Polylang plugin, the search function from my theme doesn’t work properly. What I mean with the search function is that, I wanted to add a search function, so my visitors can search through my portfolios. It worked well when Polylang is deactivated, but it didn’t work when I activated polylang plugin. It only searched through my page Title now, instead of my portfolios.

Is there any solution for this?

The page I need help with: [log in to see the link]