on a fresh load, the calendar icon is broken on a datepicker field.
Fix:
Root directory of the plugin
open mm-forms.php
Code line 5025:
ORIGINAL
$calendar_icon = get_option("siteurl") . "/wp-content/plugins".CONTACTFORM."/images/calendar.png";
add a "/" after plugins
MODIFIED
$calendar_icon = get_option("siteurl") . "/wp-content/plugins/".CONTACTFORM."/images/calendar.png";