I thought that buckle and strap looks very flimsy. I don't use it on mine, but it was the most slippery girth I've ever come across. I've had to let it get dirty to give it any sort of grip. And what are those loops above the buckles on the dressage version? They serve no purpose at all except to make it difficult to do up. I've cut them off.
If I was you I would let Prolite know and see what they say.