Why is this threefold repetition?

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Reliku

Hi guys, I don't use this forum much, but I was playing this game today and I can not figure out why the opponent managed to claim a draw here. I imagine it must be threefold repetition but I can't really understand why because the same position only occurred twice!

 

 

Strangemover

The position was repeated 3 times, after blacks 45th, 47th and 49th (and final) moves. 

chualexchu

This does count as threefold repition. Look at moves 45, 47, and 49