Text becoming Bold after publishing

I am using Daniel’s PassionDue_blue. I have a problem here. When I write a post in the WP admin area and preview it, everything is fine but when I publish it, the whole post becomes BOLD.

I do not understand why. I could not able to publish this post as it is looking very bad with BOLD text everything.

Does anybody has any idea why this happening and how to fix it.

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