Why cannot I store lumber at the warehouse of second level?

It is the game feature that high-level resources cannot be stored at the warehouse of low level. 
The amount of resources that can be additionally kept after the construction improvement is stated in the upgrade window.
Please, note that you should upgrade the warehouse up to the fourth level to place lumber there. The point is that the level of warehouse and its upgrade are different things and therefore performing the third upgrade means the upgrade from the third level to the fourth one.

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