If your options look odd on the product page or don't look the way your Shopify variants do, this is typically a compatibility issue with your theme. We're more than happy to help out with this!
We do a lot of testing to make sure Product Customizer works with as many Shopify Themes as possible, but we can't test with every single theme, and some themes might require a bit of extra set up to function at 100%. There are only very rare cases where Product Customizer is incompatible with a Shopify theme.
Please let us know about the theme issue you're seeing and we'll be happy to make adjustments.