I tried that here and I get only one like.
But it is quick here
I tested it on your post above Ruben and liked it 6 times by clicking fast and multiple times
I also did it on Britbike see this linkhttp://www.britbike.com/forums/ubbthreads.php/topics/824787/re-undo-a-like#Post824787
I know it’s unnatural but people does it