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I have a Hawke Scope on my Gamo Silent cat. I set scope at at 20 yards and move to 30 yard. Target is hit 3-4 inches high. If I site in at 30 yards, it shoots 3-4 inches low at 20 yards. Everything is tight. Use same pellets. I once could hit squirels at 15-50 yards. I am at wits end

I zero my Gamo Silent Stalker at 20 yards using gama match pellets, I move to 30 yards and shoot the same target an I am shooting 6" high. Can anyone help me understand why? Everything on the gun and scope is tight. Is it a pellet problem?