Why does this code keep displaying and how can I fix it?

[MercyGrace]

May I know, Why this code keep Displaying? How to remove it?

also when I click the Item and choose a variant it doesn't change when I add it to Cart. Only the variant who displayed was only the variant you can pick. 

Can you help me? Where Settings I should Change?

[Alex1freeman · Accepted solution]

I suggest you change the theme