Resolved Travus template | the language is changed after I choose a date from the calendar

Hello,

Please take as example the site: https://vilasebastian.ro/
move to english
go to Rooms and Facilities (https://vilasebastian.ro/en/vila-sebastian-en/73-vila-sebastian-en2?view_style=grid)

you will see that everything is english there
pickup a period from August for example (not in current month)
the page will be refreshed and then is moved to Romanian.

I need your support please.

Thank you,