Did you leave VR on. If so, turn if off when using a tripod.
I see a few posts on here saying I don't need to turn VR off because it's a solid tripod and the camera is not moving anyway.
VR does cause internal lens movement after the mirror flips up and can cause a blur on all or a part of the image.
A long slow shutter wont be very noticeable, and a very fast shutter may freeze the image even with internal lens movement. Speeds around 1/8 to 1/60 are likely to be most affected, the time will vary with different lenses. Also longer focal lengths will be most affected but all have blur potential.
The switch is there for a reason, one of the reasons is for tripod use.