GUID missing from several podcast episodes

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Hi! I recently migrated my podcast blog from Blogger to WordPress. Looking at the RSS feed, it appears that the GUID for recent podcast episodes T1 through T14 are missing, and therefore the episodes are not showing up in services like Stitcher.

This is the GUID for example episode T14, which is not showing up:
<guid isPermaLink=”false”></guid>

This is the GUID for the latest episode T16, which is showing up fine:
<guid isPermaLink=”false”>http://ancientworldpodcast.com/?p=409</guid&gt;

Am not very technically savvy, and would very much appreciate help on how to fix the GUID for these episodes. Thanks!