Storefront & Child Theme Error

Hello!

I am having an error with some “Simple” products on my homepage (Variable products seem to be fine), showing a code within the default picture. I have tested this out in the Storefront theme & its child themes. Any reason why this is occurring and what I can do to fix?

https://s17.postimg.org/p9cang7an/Screen_Shot_2016_10_19_at_6_16_53_PM.png
https://monosnap.com/file/CzVgAdp3nZ9dE5KHtGAR6R5rXt4Ma7#

Thanks!