Alrighty, I actually figured it out! Thought I would share in case anyone comes across this issue.
The extra space at the bottom of the desktop section is actually the "divider" space which I applied to the mobile section that is hidden desktop. The code above appears to hide the mobile section on desktop, but not that extra bit of room that the divider takes up.
Not sure if there's another code that would hide the divider, but I just removed it and the space disappeared on desktop as well.
