When I load an HTML widget that is (either less than the full width or even full width), the right scroll bar does a jerk to the left before coming back to the right. I have kept the Scene overlow hidden so there is no interference. But just to be sure I have checked this with all 4 Overflow settings and it still occurs.
We can’t reproduce this issue in our tests on all major browsers.
If the issue still persists on your side, you can try setting the HTML widget coordinate to top-right instead of top-left: