Variable Items in cart prevent checkout, Missing from cart

Customers are able to complete checkout with any items without fail, as long as none of those items are variable items. If any variable items are added to the cart, upon checkout the paypal link is missing and the variable items do not show up in the cart although the total is correct. It shows “your order” and the description of the order (items, subtotal, shipping, tax, total), but below it the paypal standard checkout box is missing and it does not list the variable items added to the cart. If all the variable items are removed from the “view cart” screen, checkout works just fine.

Here’s a link to one of the variable items that prevents checkout from working.
https://infectedarmory.com/product/mosfet-w-active-braking/

I’m just using paypal standard for checkout.
system info:

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