In the schematic a multi unit component is described like:
$Comp
L 74LS00 U1
U 2 1 5965ED41
P 6000 4000
The line that starts with “U” indicates it is about unit #2. Ok so far. But the field right after that should tell about the total number of units (which is 4 for an 7400). So I assume this is a bug. The line should read:
It’s a wiki, so just go ahead and update it. However, that wiki is mostly 6+ years out of date, and needs large parts re-writing. I would not rely on it much.