StringCallback and TextCallback renders in reverse order - Depending on the string, the image renders incorrectly

static void correct() {

    var customResolver = new FontResolver(@"D:\Temp\PsdTests\FontCache");
    customResolver.FontRegistry.FallbackFonts.Add("Arial");

    var psdProcessor = new PsdProcessor(customResolver);

    psdProcessor.StringCallback = (processor, textFrame) => {

        var newText = textFrame.Text;

        // A string of "Two" works
        newText = newText.Replace("{txt2}", "Two");
        newText = newText.Replace("{txt}", "Name");

        return newText;

    };

    psdProcessor.Render(@"D:\Temp\drive.psd", @"D:\Temp\correct.jpg");

}

static void incorrect() {

    var customResolver = new FontResolver(@"D:\Temp\PsdTests\FontCache");
    customResolver.FontRegistry.FallbackFonts.Add("Arial");

    var psdProcessor = new PsdProcessor(customResolver);

    psdProcessor.StringCallback = (processor, textFrame) => {

        var newText = textFrame.Text;

        // The string "2" renders incorrectly.
        newText = newText.Replace("{txt2}", "2");
        newText = newText.Replace("{txt}", "Name");

        return newText;

    };

    psdProcessor.Render(@"D:\Temp\drive.psd", @"D:\Temp\incorrect.jpg");

}