A checked checkbox is not displaying checked? Laravel

i have a problem where a checked checkbox is not displaying checked.

My view:

@if(in_array($searchgroup->id.','.$searchtag->id, session()->get('zoektermen')))
     
@else
     
@endif

I'm using laravel collective.

I'm using this code on other places on the website in different scenario's, where this works perfectly and the checkboxes display checked.

I'm using firefox but i also tried safari, no difference.

Any help is appreciated..