Error search whith this plugin

Hello
I have the flawless theme from themeforest.net https://themes.goodlayers2.com/?theme=flawless and if I use this plugin and I make a search on the menu search form, all the tittles of the results elements shows on the menu bar.
If I de-activate the plugin all is correct.
I have contacted with the theme author and he say that the theme use the normal wordpress system search.
He recommend to contact with you to ask if someone more have the same problem.

Do you know something about this?

https://www.ads-software.com/plugins/post-types-order/