Audio doesn't play in web

I downloaded a rather large deck on my android that contains audio on each card. When I sync, everything seems go well. Audio plays well on every card on android.

However, when I use AnkiWeb, on about half of the cards, the audio doesn’t play. The audio box is greyed-out.

I assume it’s a syncing issue, but I don’t know how to fix it. Syncing on my android doesn’t seem to work.

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