My squat is the exact opposite. I can do reps but the 1 rm strength isn't what the reps would have predicted.
It brings up the interesting point, that I've trained the squat primarily through volume based approaches utilizing primarily 5/5+ reps.
My deadlift, which is one of my better lifts, I've never trained above 5 reps and its higher than my 5 rep max would indicate.
I have a buddy who trained at Westside for a bit and he's always saying "sets of 2 to 6, sets of 2 to 6" and "you train like a bodybuilder". I should listen to him more.