I purchased a 5 gallon galvanized waterer from TSC for $40 and no matter how much I level it out, it over fills the trough and essentially leaks at least half out and remains filled to the VERY top until its all gone. I highly doubt my chickens went through 5 gallons in 3-4 days. I have a 2 gallon water that does not do this. Any remedies? Is this a normal thing for these?