Attached the replay and full default config, with vehicleIcon disabled, with same result as in 1st post.
14741260964492_ussr_Observer_murovanka.wotreplay
My second problem is observers has defined 90 HP in game's xml file. When the battle started, they killed, but thats does not interest for me.
Grab a default config, and do the math. Ally team has 12300 HP, but totalHP shows 12750, because in this battle has 5 observer with 5*90=450 hp
EDIT: wrong attached image
default.zip