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Seems to be caused by the following CSS rule in the styles.css file (it's a Boostrap rule):

.was-validated select.form-control:valid, .was-validated select.cd-form-control:valid, select.form-control.is-valid, select.is-valid.cd-form-control {
  padding-right: 3rem !important;
  background-position: right 1.5rem center;
}

Just disabling the above code fixes the issue.

It seems that form-control and custom-select shouldn't be used together as both are mutually exclusive. Custom select was added here.