This is a very common issue with Porto Theme on Magento 2.x.

You might get the following errors in your console while you are on the product detail page:

This is an issue with the theme itself, and by their recommendation, you should go to Admin > Stores > Configuration > Advanced > Developer, and turn “Merge JS” to Enabled.

Flush your cache and your JS/CSS Files, and that should do the trick.

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