AW third hero Fury replenish rate bugged

The Third Hero im using in Alliance Wars has a a completely different Fury-regeneration rate, compared to my 1st and second heros…the Third hero takes almost 3x as long to regenerate the same fury as the 1st and 2nd heros. ive never seen this occur in any other AW event where Ive used a third hero. 

Please advise…

Kind Regards,

TLJG

It’s based on levels of your heroes. If two are level 20 and one level 15 the fury regen on the level 15 will be far slower.