I discovered that the Radzen Context Menu can be under a scrollbar see image provided. I set the html level tag to overflow:hidden, and it fixed the issue. RadzenBody reset the scrollbar to overflow:auto and the context menu was drawn over the top of that scrollbar as expected.
Can you please take a look at this and verify this is a good fix. I'm not sure how you could wrap this type of fix with your products without documentation to show the HTML fix.
thanks
Rob