If it is bleeding down after cranking it is your gauge, and nothing else. Compression gauges have a small schrader valve in the hose that lets air in, and hold it there until you press the release button.
Your numbers look decent. Was the engine warm? Usually a warm engine will show 5 or so more psi. Also you want the peak number to be hit in the first 2 or 3 pulses. If the number slowly rises you have a major compression issue.
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