Forerunner 235 is not sync steps

Which challenges? The ones from Garmin like August Step Month or connection challenges?

Have you joined the challenge? 

For connection challenges check the privacy setting for steps. 

Connection challenges, yes I joined I have been doing challenges for a while but last time was sync was yesterday now is just showing under "my day" but not under challanges or my third party apps, already delet my watch and connected back and still just showing under "my day"

What do you see if you click the steps in My Day? Do you see the same value as in My Day? 

If  I click the steps in my day , show zero steps. Just in the front "page " of my day show the steps I uave for today