motion blur artifacts

[squintnic]

running into an issue with this blurring effect on a scene
its using animated vray proxies for the trees, but motion blur is off in both vray in 3dsmax and motion blur (post) is unchecked as well. the triangle count isnt changing just wind on a fixed mesh

another question regarding the GPU memory limits

what does -1154 mean here? does that mean i have exceeded my gpu VRAM? it IS a giant scene tbf. rendering is slower than GPU so perhaps the motion blur and slow rendering are related to this?
using 2 x 3090s on this scene. max 2023, current updates and current vray.

[npg]

The negative value means that the offline render job will use less memory than your current interactive mode usage is. This is due to differences in how we handle interactive and offline modes.

I suspect that the motion blur may be showing due to a UI issue that we have in 2.0.0 and will try to fix in 2.0.1. If you rendered previously with motion blur on, the settings get saved into the render queue on the left of the render dialog. When you open the dialog again and change the settings on the right and click start, the settings saved in the queue from the previous render get used instead. Try deleting the queue first.