Clients not getting Updates but showing in compliant

Hi all,

I am facing a very strange issue recently, I am using SCCM2012 to deploy MS updates every month.

I created a group for all the required updates and deploy it to one collection.

After waiting sometime, I checked the deployment status and I found most of the clients showing as compliant while they did not receive or install the updates.

Can you please help where to start to find a solution.

Thank you