Split: Phone menu bar suddenly closes

Hello, i have the same problem after last update and i am pretty sure it is not because of the plugins, i am using this awesome theme for more clients and after updating the theme on the websites, this bug occures when i click on the search bar of the mobile menu, the menu just closes, tested on not updated website and it works as it should but after update it dosent!

Looking forward for a solution asap

Thanks!