<field name="items" type="subform" formsource="modules/mod_modulex/fields/item.xml" min="1" max="4" multiple="true" layout="joomla.form.field.subform.repeatable-table" groupByFieldset="true" label="Subform Field" description="Subform Field Description" />
<?xml version="1.0" encoding="UTF-8"?>
<form>
<fieldset name="items_fieldset" label="Fields">
<field
name="field_label"
type="text"
label="Text"
size="40" />
<field name="field_is_required"
type="radio"
default="1"
label="Required" class="btn-group btn-group-yesno">
<option value="0">JNO</option>
<option value="1">JYES</option>
</field>
</fieldset>
</form>
The button group yes-no styling works properly
The button group yes-no styling working with the first item only. Sometimes it's working properly until the 5th child items
Joomla 3.6.2
Thank you for reporting this. It has already been reported #11299 so i am closing this here and ask that you post your findings in that issue