Giants Blood double 2-handers

Guys when using double 2-handers with bleed HotG warrior the DPS of skills get halved on skills screen. Is this a bug? The damage of each weapons gets reduced by 30% yeah I know but isnt it supposed to be still higher as youre now using two similarly high raw damage weapons? But instead it displays your DPS as halved. When I watched some footage I saw that the actual damage dealt was doubled when used on Avatar ignite build but is it simply not the case with physical builds?