Checkbox value not set on update form

i have conditional server connect database action steps for add, update, delete, when clicking on the repeated table data row it will open a dynamic modal and show the values to edit and save changes. input text values are set perfectly but the checkbox value is not set accordingly. i have searched in here and tried out almost all the help support solutions but still not working. anyone knows? i only has one checkbox. not the group, database table has IsOnline property and it is boolean. please help. thanks