LittleStain, you are right. I added the bar update with the values twice. Should instead stay in the HUD sheet. My idea is to deal with the values (since later they will be modified by a simple level up system). The way I understand it, I should add my variables and then update the bar with the values based off currentStamina and maxStamina.
The reason I added a Stamina Consumption sheet is mainly because every action uses a different amount of stamina. Some actions use a constant value and others such as running are based on the duration of the action.