Ohhh!
I see the left-hand menu bar in different places as I scroll up and down. I never really tried to understand the pattern of movement.
I just use the mouse wheel and scroll up until I see both menu bars.
Or scroll down until I see my own "custom" menu bar.
Sometimes, in-between the two, is a area where I assume ads would go, but somehow our IT department blocked most or all of those. They block a lot of stuff!
Personally, I find Internet Explorer pretty quirky in many modern websites, but I have an old version of IE (required by our outdated IT department).
I.E. = "It's Execrable!"