Instagram Reel Cover Photo is Stretched Out When Trying to Embed in Blog Post

Hello! Looking for someone who can help me since I’ve been trying forever. When I copy the code of my Instagram reels to embed on my WordPress blog, it stretches the video cover photo like here. What I want it to look like is like this or at least not stretched out. I have no clue how to fix it. Can anyone please help? Thank you in advance!

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