The "special" kind of tendinitis caused by the knee slide at the bottom would be felt in the front of the hip. It's tendinitis of the tendon of the rectus femoris (part of the quadriceps that also acts as a hip flexor and attaches to the AIIS) and possibly the sartorius (attached to the ASIS).
As far as your specific issue goes, I am not sure. I'm not sure what you mean by "squatting the wrong way" but a similar thing could ostensibly happen to your hamstring attachments (as the knees shift forward they pull on the respective origins of the hamstrings), but that doesn't explain the insertion point soreness unless you are wavering backwards and forwards and the hamstrings are being pulled at both ends. This of course is total conjecture on my part as I've never heard or read or seen such a thing. Maybe Rip would be a better person to ask this question?