NSubsitute - Receive() fails when more than one method of the same service is invoked

Question

I'm switching from Moq to NSubstitute and have a weird problem - I have a simple Interface which I subistitute:

    public interface ISampleService
    {
        string GenerateCode(SampleData data);
        BitmapImage GetCode(string code);
    }

Above interface is called in this method:

        public void GenerateCode()
        {
            SampleCode = _sampleService.GenerateCode(Label);
            Code = _sampleService.GetCode(SampleCode);
        }

And try to verify that both method were called but below test fails:

        [TestMethod]
        public void SomethingChanged_WhenIsChanged_SampleCodeShouldBeGenerated()
        {
            Sut.GenerateCode();

            _barcodeService.Received().GenerateCode(Arg.Any<SampleData>());
            _barcodeService.Received().GetCode(Arg.Any<string>());
        }

Only last substituted method was verified as invoked _barcodeService.Received().GetCode(Arg.Any<string>()); but _barcodeService.Received().GenerateCode(Arg.Any<SampleData>()); throws ReceivedCallsException

When I change the order of invoking methods in Sut.GenerateCode() method - situation is opposite: _barcodeService.Received().GenerateCode(Arg.Any<SampleData>()); is verified as infoked but _barcodeService.Received().GetCode(Arg.Any<string>()); throws exception.

Interesting thing is that when run this test:

        [TestMethod]
        public void SomethingChanged_WhenIsChanged_SampleCodeShouldBeGenerated()
        {
            _sampleService.GenerateCode(Arg.Any<SampleData>()).Returns("111");

            Sut.GenerateCode();

            _barcodeService.Received().GenerateCode(Arg.Any<SampleData>());
        }

It throws ReceivedCallsException but Sut.SampleCode = "111" -> It seems for me as only last call of substituted service is notified as invoked...

I cannot also invoke Received.InOrder method because it throws CallSequenceNotFoundException

Could you please let me now what I did wrong? Thanks in advance for your help!

PS. When I change testing method like below (double the line: SampleCode = _sampleService.GenerateCode(Label); all tests are green

        public void GenerateCode()
        {
            SampleCode = _sampleService.GenerateCode(Label);
            SampleCode = _sampleService.GenerateCode(Label);
            Code = _sampleService.GetCode(SampleCode);
        }

Did anyone has similar situation?