AutoInput Does the website recognize that autoinput is being used?

I am trying to get tasker and auto input to open a web page and sign me in as I arrive at work. I'm pretty new to this but opening the page is easy and chrome fills the user name and password fields it's self so all I need is autoinput to press the sign in button. I got that working too, but if I use the task I get a "username and password are incorrect" page. If I hit back in the browser and immediately press "sign in" again.... Or if I just repress in from where I am, it works great.
So why won't it work with the autoinput?
Is it adding something to one of the fields before the button press? Or does the website know it's being accesses by software? I'm baffled.

 

Hmm... I'm using chrome beta.... Maybe that's an issue? It definatly clicks the button. I'm using the type:text value:Sign In