Small block starter and flexplate issue

Guys

When installing the starter on the block, we tried the starter to verify everything was fine on the flexplate clearing the starter. But the starter engages the flexplate to start and then it kindly get stuck. But when trying to move the crank via the damper bolt it jumps back in.? Is this normal? Or are we just overtinking here? I have a video... of it but is too large to load it. Any way I can send the video?

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