Hey SMVJ
The muscles sure could have stretched and the injury has made them somewhat susceptible to re-injury and causing pain. That area may always be a little "easier" to injure or more troublesome. Sometimes that type of injury will follow you around for a long time.
It could also be a very slightly bulged disc caused from the sudden snap of the weights. When you work or stress the area, your muscles react and try to "protect" that area by tensing up causing discomfort and pain.
I would just favor it a little and go easy on the hardcore stuff. Twisting while bending over are very bad and could cause it to become worse. Maybe some easy strengthening exercises to that area would help it. Proper posture, general exercising, and keeping your activities reasonable will probably help in the long run...no powerlifing.....extreme sports (not too much anyways

) etc.
I wish you well