Stop and Shop complaint: Treatment by an employee and security patrol

I had two incidents at this location where I felt like an employee was suspicious of me. First incident two weeks ago I was at the self check in and I got some message on the screen to check with the attendant. As soon as the attendant came over the message disappeared. Next, after I had paid, with cash, got a receipt and was packing my food in bags the attendant came over and asked if I paid. I said yes and she put some card in the machine to waive whatever she thought she was seeing. I left and thought nothing of it. An incident today occurred where I was at the self check-in, paid for my groceries, packed them, got an attendant asking if the coupons on top of the machine were mine and I said no. I left and outside as I was packing the groceries in my car, a security patrol car, stopped across from me, flashed lights and honked horn, but guard never came out. I drove away and as I started out on union turnpike the same patrol car came behind, it was rush hour so we were going slow. I had to make a left on Woodhaven blvd and as I did, the security patrol car was on my tail, blinked the lights and honked horn again. I kept driving since the guard was not attempting to stop or grab my attention or driving alongside. I slowed down further to give the guard a chance again to stop me but same reaction. Finally, the guard made a right on another street and left.