Search issue

Hello,

I got a bbPress forum on my website using this template : https://afthemes.com/products/elegant-magazine

My version :
WordPress : 4.9.8
BBPress : 2.5.14

My problem is when I use search function on my forum, its works not fine : the result is not display. And when I try with Twenty Seventeen theme for exemple, the search works.

My question is : What I must do ? Change my theme ? Or its possible to fix it with my current theme.

Thanks in advance bbPress family !