help:JQM1.2.0 use jqm-DateBox image change line,JQM1.1.1 is normal. Why

help:JQM1.2.0 use jqm-DateBox image change line,JQM1.1.1 is normal. Why

help:JQM1.2.0 use jqm-DateBox image change line,JQM1.1.1 is normal. Why