Multiselect dont work

Hi,

We did some changes to the filters system in the 5.1.1. I reviewed them following your message, but I couldn't see what could be the cause of this problem.
Could you provide a backend and a FTP access via our contact form in order to look at the problem deeper ?
www.hikashop.com/support/contact-us.html

Hello,

We have recieved your ftp, but you have forgot the backend access to your website, can you please complete with :
- An Url link to your backend (administrator)
- Backend user references (with maximum Acl)

Note : Use as previous our Contact us form, and like previous add an Url link to this topic.

Hello,

It's always possible to select several Brand, but the issue is that your module filter update dynamically too quickly.

If possible, you can define options to don't dynamically update result and with just a defined criterion but to have a filter button instead?
This will solve directly your current issue.

Are you sure you don't change something in your module settings?
Regards