Meterk EMF meter showing 20+ millegausse near two outlets only. Both outlets have nothing plugged in. Possible live and neutral wires faulty?
Just because there's nothing plugged into the outlets doesn't meant that there's no current flowing in the wiring - if they're part of a chain or ring there could be a draw elsewhere that causes the field.
Near the two-core wire (twin and earth, but only two carry current normally), there'll be a field that is very local, since the effect of the two opposing currents cancel out at significant distances, but near the socket where the conductors are separated more, there will be a stronger field.
Meterk EMF meter
I assume you mean this meter, or one very much like it?
This type of meter is effectively a toy made for pseudoscientific purposes like "ghost hunting" and investigating "electrosensitivity". It is not a reliable nor an accurate instrument for measuring electrical or magnetic fields.