QAVION is correct on this one. .... The outboard LE flaps retracted well before the TE flaps got above the F20 position,...."
??? Sounds like I was only partially right.... I said:
".... the Group B LE flaps (outboard) begin to move when the TE flaps (not the flap lever) are less than 4&1/2 units (and the flap lever is moved to 1 unit)."
Were they being retracted normally in your situation (hydraulics and pneumatics available)? I've seen some strange things happen when circuit breakers have been pulled and the flaps have been extended in ALTernate mode. When you think everything has been reset, with the flap lever in UP and the flaps up, and you switch on hydraulics, the flaps begin to extend. Very alarming.
I may have to check this out for myself when I get back to work.
Cheers.
Q.