Yep.
Sometimes mine hugs the centerline.
Sometimes it just drives right over the right side shoulder when the road curves gently to the left.
Sometimes it weaves back and forth within the lane like a drunken near-sighted toddler with amnesia. It's as if it's looking for both line markers, but has to drive nearly on top of the line to find it, and then it forgets where the other line was, and swerves over to the opposing side, and just keeps swerving back and forth. If a cop were behind me, I would definitely get pulled over for suspected DUI. It's that bad.
And then other times, it drives perfectly straight.
I've had it swerving on perfect interstate pavement on a clear sunny day, and then after getting off and getting gas and cycling the ignition and getting back on the same pavement, it drives perfectly straight. So it seems like either a software problem, or, because I have SO MANY ELECTRICAL PROBLEMS, it may be something wrong with the vehicle wiring harness, or one of the modules. It's a shame, because it's a really nice system when it works. It's just not reliable, which is really bad for a safety-critical 'self driving' system.