When i updat the windmill, it does not add the hams to the strong hold. i am stuck at 950
Yup storage in windmills and mines dont count towards overall storage just what they hold until ypu transfer to storage buildings.
adding to what Talixax posted, the watchtower also doesn’t count towards overall storage of resources.
You should have or be able to build food storage (the silo). This will increase the max.
The stronghold increases the building max, the food and iron storage buildings increase the actual storage cap