No worries. It's probably just static electricity built up from probably rubbing against the fabric. My SR5 is notorious for this! It even got to the point where you can see the spark arc when I stepped out of the vehicle as I reached for the door handle to close the door. Of course, I constantly shift in my seat. Try touching a metal part (like the door lock anchor on the B-pillar as you step out) to dissipate the charge before stepping out. No shock. Since the fabric on my Sport is slightly different, I don't get zapped as much if at all. You could also start wearing a tin foil hat.