I am not sure if this is intentional so didn't want to post as a bug. I went mining the other day had a bunch of washed stone on me so I threw it in my house storage. I went to pull it out and it would only let me take 7 at a time I tried this with other items too. It seems whatever the limit is at the gathering point for said item that's all you can get out of your house and have to run to you car and empty your inventory of said item. It was basically like rewashing the stone. I didn't mind this with drugs cause I never pull a lot out at once anyway and the stacks are 50 each. If its a tough fix I don't mind storing stuff in vehicles as this always works fine.