I may have seen something like this once in my 4 years with the platform. I don't know what causes it, though my guess might be some network traffic/latency spike. If you are able to reliably get it to do this, you might want to submit a ticket through the help center with all the console logs, browser info, etc. I've seen it come up on the forums now and then, but I don't know if there has ever been a definite answer on why some people get incorrect 3D dice now and then. Troubleshooting steps with the info to gather if you end up submitting a ticket: <a href="https://wiki.roll20.net/Solving_Technical_Issues" rel="nofollow">https://wiki.roll20.net/Solving_Technical_Issues</a>