Hello Lord PMAH26, i tested that few times today , on plarium com and also on facebook servers , and from my edge the brawl works fine , included the Unit Movement Speed +200% . Here is an almost similar raid at 2,47 miles ... i make 1min 29 sec

So there is no bug my Lord.

Hello PMAH26

If you look at the bottom of your screenshot you will see that the speed of your wyverns is showing as 98.4 mph ... the normal speed for a wyvern is around 40 - 50 (ish) mph depending on rune skulls applied, hero ability level and league fortress knowledge bonus.

What this means is that the speed boost from the event is being applied to your units .. also please remember that there is a minimum travel time to a castle when raiding .. usually 1m 15s on Untamed Lands (this may be diffent on other servers).