We have a double-pole breaker that seemingly is connected to two outlets in the same column/post in a room. 3-Light tester reads all three lights, multimeter reads around 240 volts in each outlet. With four wires per outlet, I assumed the person that wired these simply forgot to break the tabs, thus causing the 240. I broke the HOT (black) tabs, measured something low like 12v from three plugs and 240 from the fourth... Broke the other tabs, and now it's 240 on one plug and 0 on the other three...
I'm not sure what to think now, about how this was ever left wired up like this.
Outlet 1, Top measures 0.02 V, Bottom measures 238 V, slightly fluctuates.
Outlet 2, Both measure 0.02 V.
Background information: It's the same support beam behind each, just different sides. When we bought the house a month or so ago, this was the only outlet the inspector must have missed. After realizing something was wrong, the easiest thing to do was attempt to replace the old-looking outlets. On the old outlets, the tabs were all still intact but they were connected via the push holes instead of the screws.