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Did you read the "Caution 30 PSI systems only" warning on the pressure tester, BEFORE the red zone. You had the pressure tester pegged, not good. I doubt your system is over 15 PSI.
It's totally normal for pressure to drop as the engine cools down. Coolant expands as it gets hotter, contracts as it cools.
Try it cold, it should hold pressure, but don't peg the tester again unless you want to create leaks that may not exist now.
Get back to us with the cold test results, if it does not hold pressure pull the plugs and look for coolant in the cylinders with a pen light.
regards
mech
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