Problem with dispenser. It drop bucket with water, powder snow etc. insted of placing water, snow block etc.

it started when i wanted to place dispenser to put and pick up powder snow. whenever i activated dispenser it drop bucket with powder snow not block. it goes same way with water bucket, water bottle. id doesnt matter if i use button, levers, detectors etc. evrywher i shearch dispenser is suposed to place and pickup powder snow.