Help with timer problem

Hi,

i have a problem in my blueprint. I don’t understand with my timer dont works…
at the print string test for show the current timer, i always have 1 or the timer need to be at 20 going to next step.
The widget visibility / hidden actually don’t work here for moment. (no question on that for make it works after)

i have make a basique test like the next screen where that works.

Someone can explain me why that don’t works ?

Thx