contains() stopped working in my app

contains() stopped working in my app

the contains() function seems to have stopped working; at least on multiselect fields.

Please check my app:
oncalendar
user: t.e.sadler
it is open to support

use the function f_testStatusTypes with an input value of "10". this should be true.
I have tried it in another version of this app under another login. Same problem.

I'm confused.