So just your second round is hanging up? Have you tried only loading just one in the magazine (should be fine), then just two in the magazine, then three, etc. to narrow down if it is a question of a full-mag's-worth of ammo pushing up on the second round?
A short test might identify if a full-ish mag is causing the misfeeding, but I don't know why it would only manifest itself on #2...unless "8 more below it" is a problem. (But then I don't know why #1 chambers ok, with 9 below it. Hmmmmm.)
Good luck.
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