I agree with Amy, that the ad blocking is deleting the frame compressing the page causing the display overlap.
As an "aside", the other day my "IT Guy" was telling me about a different extension that I might check out..... (senior moment) for the life of me I don't recall what it was! Anyway, it was intended to obscure your ad tracking trends..... not by blocking trackers, but by registering "click through" on EVERY ad on EVERY page you visit EVERY time you visit! That would really drive the ad revenue up on a site you like to support!
I'll get the scoop and post it somewhere like Chat Corner so members who like can decide if it's viable as a way to help Chordie a few cents at a time. Ad $$$ do contribute to keeping Chordie free. Here it is: https://dhowe.github.io/AdNauseam/
A Firefox extension that runs in concert with adblock (required), version for Chrome "coming soon".