The WPFTS Pro version you are using is very outdated. Please consider upgrading to 2.46.x which is the latest. It has a completely new indexing and searching algorithm and it should solve your issue.
Unable to translate "Search" widget
I'm trying to translate the "Search" widget but the wpfts_lang.pot file available at fulltext-search-pro/languages directory has no entries neither for the search placeholder nor the button text.
How can I translate de search widget?
Do you use the free or pro version of WPFTS?
I am using the Pro version. My registered email is : email@example.com