How to resolve filter issue on Kalle theme collection page?

[Venturesome]

Greetings community!!!

I am developing a store using Kalle theme but i have a problem with filters on collection page.

When you click one e.g 1 brand the rest of them disappear from the brands filter and only the active one remains visible  so you arent able to choose a second one to show up in the collection. Is there any way around it. I can provide the block of codes for liquid and Js

Thanks in advance