Hi!
The problem there is how you try to open that URL.
https://redpilluniversity.org/?s=GE Griffin’s lectures & productions
The “&” symbol is used by the server as a query parameter separator. It is not a plugin thing, it is how the request URIs work on the web. This query actually means for the server, to set the “s” argument to “GE Griffin’s lectures ” and the “productions” argument to an empty string.
The correct URL for that query is:
https://redpilluniversity.org/?s=GE+Griffin%E2%80%99s+lectures+%26+productions
When you make a search via any search form or make any type of request, the URL will be encoded this way, so the “&” symbol does not act as a query argument separator.