Google doesn’t show the right description – how to fix

Hi guys,
I need your help. I use All-in-one SEO plugin for wordpress to write the title and description for my site: template-coupon.com. But when I search the result on google, it doesn't show the right description. It automatically generates the description. Pleas take a look at this sample
View attachment 132468
I've waited for more than a month but Google hasn't updated the right description. Did you get this trouble? Please tell me how to fix it. Thank you so much

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