Spice Roads (Abbasid) returning less than listed for Trade Ships

The tooltip reads: “Increase the Gold income from Traders and Trade Ships by +30%”

This is accurate for Traders. However, for Trade Ships, the return is consistently 10% less than the listed percentage.

Numbers from most recent tests:

Test 1
Trade Ship Gold Income: 69 → 83 (20.28%)
Trader Gold Income: 110 → 143 (30%)

Test 2
Trade Ship Gold Income: 92 → 111 (20.65%)
Trader Gold Income: 110 → 143 (30%)

As abbasids my resources usually lower than my team even with having more villagers or caravans at end of every game

We are checking into this @LocTalon. Appreciate the report!