The issue seems to be in the modal.js file of the ionic library
https://github.com/driftyco/ionic/blob/1.x/js/angular/service/modal.js#L194
The temporary fix:
var isInScroll = ionic.DomUtil.getParentOrSelfWithClass(e.target, 'scroll'); if (isInScroll !== null && !isInScroll) { e.preventDefault(); }
Another possible solution is to add the class=”scroll” to your input element that is of type range.
Link to the github issue.