Different overall guild trophy rewards for quests on the same difficulty board

Just noticed something that may or may not be a problem. On our current Medium board, quests that involve winning with a particular type of ship have overall reward of ~2300 trophies. Other weapon based quests have a reward of ~3000. Heal points quest has overall trophies reward of 4190. Not sure if this is because some of these are perceived to be different difficulty, but I do expect all quests on the same board to award the same amount of trophies. This could be important for guilds that use trophies to track contribution, etc.