A lot of people saying things without reference - if you can't back it up, don't say it.
Cough, as for why that happened - well, there's a reason why the word 'coincidence' is in the dictionary. Are you SURE it's because of that? Or is it because your colleague changed the wind in the box? Is it because GS mini was having a play? Vapp changes all the time, Vls doesn't - Vls is determined by weight. Vapp is on the basis of Vls, 1/3 wind, athr, ice accretion etc.
Peter, not necessarily. Having an extra knot isn't unsafe. 1 tonne is 1 knot. Being a pilot and flying is all about being around about right. Pilot maths: 2+2 is about 5. There's 3% error in Vls calculation and we are instructed to increase the gap between Vls and Vapp to 5 knots as it often shows as less on the PFD.