The issue is probably with the $single parameter of get_post_meta function. Try setting it to false or delete it. Codex Link
Then,
$omc_os_poker_room = get_post_meta(get_the_ID(), 'omc_os_poker_room');
echo '<p class="omc-info-one"><b>OS: '.$omc_os_poker_room[1].'</b>';
Not tested, but should work.
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