Perpetual check (in Shogi) is a draw??

I understood the rules clearly say that perpetual check is a loss for the check-giver.

Why did this game get drawn then??

Is the rule implemented incorrectly, or did we not understand it?

after moves 28, 36 and 52 we have 3 times the exact same situation with the same player to move, I think that's why it is a draw.

Yes, but *all* your moves were checks. Unlike in Western chess, that is illegal (i.e. the last move should not have even been permitted). (With the minor provision that Shogi actually counts *quadruple* repetitions, not triple repetitions).