Hi,
The problem seems to be caused by a custom script, which is directly printed to the document footer: https://i.imgur.com/iTJlFhi.png
The script part I highlighted will go through all input fields, and replace their values with the placeholder texts, and removes them when the input is focused. That causes the “Search here..” text to be added to the input value as the search phrase – yielding no results.
Removing that script or modifying it to only work on input fields it was intended for will resolve the issue.