So I looked at the AD&D version (included in the Spoiler) and in that map, North is Up. But it was also spread out across three 8.5x11" (roughly A4) pages in 3 vertical oriented pages.
When they decided they were going to put this into Yawning Portal, my guess is someone at WotC figured out they could fit it all onto two 8.5x11" pages if they connected it all into one map going long-way across the two pages and rotating it 90°. But that also meant they needed to preserve the North orientation in relation to the rooms. So thus was born the North to the left issue I (and everyone) am experiencing. See 2nd map in full color in Spoiler.
I will also note that the WotC version they forgot to label which rooms were "Second Tier"; but that's not actually impactful nor important to the adventurers since it's not really mentioned in the box text.
Mystery solved, annoyance unresolved...