This happened to me as well. I’m using v5.7.2. The workaround I’m using is a refresh as well. This is the piece of code I’m currently using.
positionsListBox.jqxListBox({
displayMember: 'Title',
itemHeight: 70,
height: 210,
width: '100%',
source: new $.jqx.dataAdapter(
{
localdata: result,
datatype: "json",
datafields: [
{ name: 'Id', type: 'int' },
{ name: 'Title', type: 'string' },
{ name: 'Description', type: 'string' },
{ name: 'StartDate', type: 'date', format: 'dd-mm-yy' },
{ name: 'RoleId', type: 'int' },
{ name: 'EndDate', type: 'date', format: 'dd-mm-yy' }
],
id: 'Id'
})
})