I have this problem too!
I found a fix for that. It seems that suddenly, the Store app remembers some inexistent updates (?).
To fix that, you have to go to the %temp% folder (WIN KEY + R, enter %temp%) and you'll find a file called winstore.log.
You have to delete this file, but you have to close 2 process first: Runtime Broker and Com Surrogate.
Runtime Broker it's easy to close, but Com Surrogate restarts automatically, so you have to close again, and delete winstore.log inmediatly.
Once you have deleted it, restart your PC. When it restarts, maybe you will se the "2" number (in the Store tile)... Open it, and you'll see the "2 Updates available" is gone.
Oh dear, please do not do any of those things. They will have no effect on this problem. It's a known issue where sometimes the Store app says there are updates before they're fully available. Within a few hours at most it should fix itself automatically (when the update is actually offered).