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Just as Radeanu said on his comment, objects that have a header or divider property are considered special cases. Currently there’s no way to change that behaivor in vuetify, so, you’ll need to either rename/remove that property from your objects array.
this.arrOfObjs.forEach( function(data) {
data['headers'] = data['header']
delete data['header'];
});
Source:stackexchange.com