Need help troubleshooting a weird suspension issue...

[dminner]

I need so help trouble shooting a really werid suspension problem. My car is on tein coilovers.

My passenger rear wheel gap is a 1/2in lower than the driverside rear. The coilovers are maxed out so the height should be the same.

I assumed it might be a blown shock. I took the shock out to check it and it is fine. The springs are seated in the same way. So I thought maybe somehow one spring is wearing faster and sagging???

I decided for the time being I would simply adjust the passenger coilover up a 1/2in to accomidate. But I would still like to know what might cause this.

Any ideas?