Referee somehow awards phantom corner kick instead of legitimate goal

Watch this goal.

Seriously, watch it.

Now try to explain how the goal was ruled out and instead, a corner kick was given. Because that’s what happened. The referee watched the ball come off the post right to a Kortrijk, who kicked the ball in the net. Then he blew his whistle and pointed to the corner.

Really, if you can explain it, you are either brilliant or disturbed.