Search function is no longer working

Hello,

I love your plug-in and started entering in kb posts. At first the search function was working (yesterday), but when I tested it today it was no longer working (as in articles are not being displayed when searched for).
I checked the permalinks (and clicked on it just to make sure that wasn’t the issue) but I’m stuck now.
Please help, I’m supposed to demo it on Tuesday.

Thank you

https://ww.wp.xz.cn/plugins/knb-lite-knowledge-base-faq/