PE cheaper than Economy

Interesting quirk in the booking system at the moment.
I guess it must be due to that large number of XL rebookings and a shortage of Economy seats.
Just checked MAN/MCO Nov/Dec and found it is cheaper to fly out in PE lowest than in Econ Lowest - 180 cheaper!
Econ. seats must be almost all gone but still reduced price PE available!

I've just checked my upcoming MAN-MCO flights in November & there is not a seat to be had in any class. This is on Saturday flights both ways (so 2 VS flights to/from MAN). The demise of XL has clearly delivered some benefit to VS - that said, I've done MAN-MCO in early November for the past few years & the flights have never been empty, far from it.

James