There are two visible issues with this field although I suspect that they are the result of a deeper issue with the field type.

1. Accessibility

As can be seen in the generated code below the select has the wrong id - it should be the same as the for attribute in the label.

	<div class="control-label"><label id="jform__ordering-lbl" for="jform__ordering">
	Ordering</label>
</div>
	<div class="controls has-success">
		<select id="jformordering" name="jform[ordering]" class="custom-select valid form-control-success" aria-invalid="false">

2. Numbers

Unlike similar ordering fields this one has a first and a last entry but you will notice that they are without a period after the number