Hello,
I have not personally seen this before, but definitely check out this post and the responses which seem to be the same problem:
Also, can you attach your code, or preferably a simplified example, which illustrates this so I can replicate this and explore it? Please also include your LabVIEW version in the post.
Perhaps that 3D graph instance was corrupted. For sanity, can you try replacing the 3D graph - does it occur with the replacement?
Ok, looking forward to your repost!
Best Regards,
JLS