I have two different problems but I think they can be related. On one side, Lightroom CC (Desktop) is stuck syncing 2 pictures, when I search for them (Sync Status->Syncing) it shows no results, and I have already reseted and reinstalled it with no change. I have checked on lightroom.adobe.com and both show the same amount of pictures, and no sync issues.
That leads me to the second problem, I have two android devices, and Lightroom (Android) is synced, both of them, but the number of pictures doesn't match the one in Lightroom CC Desktop and lightroom.adobe.com
If I import a new picture from any device or online directly, the syncronization works perfectly (although Lightroom CC Desktop is still stuck with 2 pictures)