Check if this plugin is active "WooCommerce Easy Checkout Fields Editor". Disable it.

If you want to move the date field before the time field, then you simply need to change the hook position. Go to our plugin setting > Delivery time. At the bottom you find a value for the hook priority....

Our plugin has a built in business / opening hours widget, that you can use to show off your times. First you need to have opening hours created in the backend settings. Then you can head up into the widget...