When you choose to create a Custom Audience based on your Facebook fan page, you have several analytics choices available to you:
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People who currently like or follow your page
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Everyone who is engaged with your page (what we usually recommend)
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Anyone who visited your page
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People who engaged with any post or ad
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People who clicked any call-to-action button
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People who saved your page or any post
Depending on what you choose as an event, you will get a different audience size. Therefore, don't always rely on the number of likes on your page, check what you have chosen as a starting setup by creating your Custom Audience based on your Facebook fan page.