Multichoice list is NOT populating

Multichoice Lists (custom field for contact) are NOT populating all selected values though API but only one option is being added

{
"id": 1762,
"alias": "Property Types Investing In?",
"field": "f1762",
"type": "list",
"required": 0,
"unique": 0,
"editable": 1,
"deletable": 1,
"options": "[{\"value\":\"225\",\"label\":\"Commercial\"},{\"value\":\"224\",\"label\":\"3+ Unit\"},{\"value\":\"223\",\"label\":\"Duplex\"},{\"value\":\"222\",\"label\":\"Condo\\/Townhome\"},{\"value\":\"221\",\"label\":\"Single Family\"},{\"value\":\"220\",\"label\":\"Mobile\\/Trailer\"},{\"value\":\"219\",\"label\":\"Raw Land\"}]"
},

If is set f1762="225,224,221", it only select/add "Commercial" NOT all 3 selected...