Math in my Advanced Slides looks weird

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What I’m trying to do

I’m trying to type some math such as $$a=b$$ when editing in Advanced Slides, but it turns out to look weird in the preview:

Things I have tried

I’ve tried to check the official guide of Advanced Slides ans copied their codes in my computer. It’s totally different from the official outlook.
So what’s wrong with my Advanced Slides?

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