Also try this in FR as I think the old Kindle browser can’t handle the side bar.
On the top of FR, go to Account > Manage Blocks > disable all the sidebar blocks. This should give you just the main page with nothing on the side.
OK, I was able to fix it by moving the sidebar blocks to the top. All is good now. This only works when logged in though. Thanks much. I use my Kindle Bible at church and need to look things up sometimes.