I'm seeing the same issue. Hopefully I can provide more details. It happens after leaving Orion open for a while (maybe days?). Some pages I see it on: Github, discord web client, Linear. If I quit and reopen Orion it goes away. This doesn't ever happen on safari.
It looks something wonky starts to happen with the momentum of the scroll, maybe an integer overflow? When the issue starts, if I scroll down really slowly it works, if I scroll down faster by flinging my finger, it causes the page to scroll all the way up past the content. So at this point the only way of scrolling down is by doing so really slowly
It goes away by restarting Orion. I'll add more details if I can make it consistent. It's a really distracting issue.