Portfolio filter does not work

Hi BlueOwl.
The portfolio filter does not work on my site. I tried to disable all the plugins, but it does not solve the issue. Also, I have cleaned up the browser cache many times, but the problem persists.
I have no idea what happened.
I noticed the problem came after I disable / delete the NextGen Gallery plug-in, but I don’t think it was the cause of the problem…
The URL of Portfolio (slug= outdoor) page is this: https://www.guidedolomiti.com/pro/
Pleas help me
Thank you.