the Brother QL-820NWB label size(62mm x 100mm) is working fine on Android but not on iOS?

[SEENIVASANIT]

 var printer = Printer();
    var printInfo = PrinterInfo();
    printInfo.printerModel = Model.QL_820NWB;
    printInfo.printMode = PrintMode.FIT_TO_PAGE;
    printInfo.isAutoCut = true;
    printInfo.isHalfCut = false;
    printInfo.isLabelEndCut = true;
    printInfo.port = Port.NET;
    printInfo.paperSize = PaperSize.CUSTOM;
    printInfo.printQuality = PrintQuality.HIGH_RESOLUTION;
    printInfo.labelNameIndex = 15;

    await printer.setPrinterInfo(printInfo);

    // Get network printers
    List<NetPrinter> printers =
        await printer.getNetPrinters([Model.QL_820NWB.getName()]);

the Brother QL-820NWB label size(62mm x 100mm) is working fine on Android but not on iOS, the label size(62mm x 100mm) is printing too small on iOS but works fine on Android

print correct label size(62mm x 100mm in ios)