A: Why my sku grid items are still paused?
Q: Please note they are paused until you choose to unpause them.
So to unpause them, you can do all of them at one time by going to Batch Options >> Resume Checking & Updates on All Items 
or you can do selected items by putting a checkmark next to ones that you want to unpause and doing Multi-Item Actions >> Unpause Checking & Updates on Selected Items.
Since the items were "paused" though, they also were not being checked. We'd recommend after you've unpaused them to do Batch Options >> Recheck All Items ASAP and then Batch Options >> Force All Items to Update. Give it some time and your items should be updated.