Merchant not working right in 3.1?

Explore on Warlord 1, with 3 x merchant troops and a tank. 100% gold armor.
Says gold up to 175.
With 115 gold accumulated, I get 851 gold in explore.
With 175 gold accumulated, I get 851 gold in explore.

What I expected - getting different amounts of gold in match should result in different amounts of gold in the reward screen afterwards.