By: Junaed-Ar-Rahman

In reply to Jason.

Thanks JASON for your comment.

The issue you are encountering is the result of two potential situations. The first scenario is that you have implemented an additional conditional formatting within your data range. The second scenario is that you have not adjusted the formula to align with your data.
However, you can modify the formula for conditional formatting and replace it with the following one.
=IF(ISBLANK(Search_box),"",SEARCH(Search_box,$B5&$C5&$D5))

Remove all the conditional formatting except the dedicated one given in the method. Also, check whether there are any VBA codes running in your worksheet affecting the changes.

Regards
Md Junaed Ar Rahman