Hi,
Just noticed an airbus flying very very high. (EZY8806 - FL774)
I also noticed a few minutes before an aircraft that was on approach to EBBR.
It was decending because vertical speed was negative, but the altitude show on the label was increasing. I think maybe something was wrong due to the cold weather? Maybe frozen pitot or something like that.
Vertical speed is not measured by pitot pressure but by the static port which would be unlikely to freeze over.