Lamb charge displays as passant for all attitudes

I was trying to do a recreation of an old shield. Most sources agree that the shield was _Azure, a lamb rampant argent_, such as in the example image below, but all I can get Drawshield to do is a _lamb passant_.
[drawshield link](http://drawshield.net/create/index.html?blazon=azure%2C%20a%20lamb%20rampant%20argent(%2C%20a%20mantling%20of%20ribbons%20azure%20and%20argent))

it gives me a warning that `lamb-rampant may not be drawn with rampant` and suggests `try salient instead of rampant?`. _Salient_ also displays as _passant_ and gives a similar error that _rampant_ gives, but doesn’t suggest an alternative attitude. I tried it with a few other common attitudes as well and got the same result