Please check Woocommerce > State. In most cases, this issue is connected to the PHP max input vars limit parameter in your web server configuration. You can check the current value for this parameter in your Dashboard -> WooCommerce -> System status. Usually, this parameter is not allowed to be changed on shared hostings so you will need to contact your service providers and ask to increase this limit. Recommended value for this is 5000
You need to enable swatches in the translations as well Dashboard -> Products -> Attributes -> Color -> Configure items, enable swatch as shown http://prntscr.com/jskm29