gorgor contract drop rate balancing?

[BlazeMG]

I have played this game for a while and noticed that the drop rate of contracts depends on the amount of contracts in your inventory. When I have no contracts, I can get a couple of them in an hour, but with 3 or more in my inventory it feels like drop rate gets drastically reduced. Is the game trying to prevent players from hoarding the contracts to make gorgor contract-related guild assignments more challenging, or is it just me and my bad luck?

I would like other players to reply too, to see if this occurred only to me. Because 3 contracts are not always enough to get even one spawn of a strong monster on those locations.

[Vsmvms]

I have no contract and yet after spending half of my vigor not a single one dropped

[Diablo_Average]

Gorgor contract drops with a small chance, use a guild buff to increase it