Sounds like you put the piston in backwards....... the arrow on the top of the piston should point to the exhaust.
The ring end gaps should be on the intake side of the cylinder, if you hooked a ring end-gap in the exhaust, the piston was put in backwards.
Also, maybe a piton pin clip came out, they can be hard to get in and it takes some experience to know when they are seated properly.
JMO, Ron
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