I received a 10% reduction to labor golem cost (Gizbin's Insight), which is reflected in the tooltip (mana cost: 270 where it used to be 300)
When I cast my first instance of labor golem, the proper cost is taken from my pool and the proper amount is reduced from my max mana.
When I cast my second instance of labor golem, the cost is reset to 300, and the mana cap becomes the default (300 x # of labor golems)
This issue does not resolve until I save & exit then re-enter the world, where it begins happening once I summon more than 1 labor golem.
OS: Win 7 prof 64
Java ver 8 update 241
CPU: AMD FX-6300
GPU: Nvidia GTX 1070Ti
RAM: 16GB DDR3