MKY661 -
You are probably right - and we also had a long wait on the airbridge. I think the flight was initially shown as "Boarding" about 50 minutes before the STD.
As an aside - I was surprised at just how quiet the airport at Malaga was - but I suppose a Monday evening in mid-February is hardly peak time for a Costas Airport. Very impressed with the nice airy seating area in the D Gate Departure Zone though.