Why are some input fields at checkout different heights?

This is usually your theme overriding Cart66 Cloud CSS. You can add the below to your theme's CSS and reslurp or you can add it directly in the Cloud HTML area using the link below:

.cart66 input{box-sizing:border-box;>-moz-box-sizing:border-box; /* Firefox */box-sizing: content-box!important}

You can also try:

.cart66 .cart66-form .controls input {height: 30px !important;}

Here is where you can find it in your Cloud Dashboard:

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