Happened to me too with some building materials. I take screenshots everytime I increase my amount of building materials/expansion materials/diamonds. I once got re-given 5 diamonds I found in a box which were lost after 2 minutes due to server issues...worth a try...Just a caution to everyone on purchasing items today. I have made multiple purchases of food and building supplies. The money gets deducted and supplies are initially in barn but then when log back on....the items are gone from barn and money is still deleted. I have reported to Hay Day my issue.