I got that too when I did the internet dating thing for like 3 weeks. Although I never got 3 messages from the same person like you did - that girl sounds scary, Dan! Also, she either doesn't read or doesn't pay attention to details.
I got a lot of those too. I indicated that I value good spelling and grammar on the site I joined, and then I get some message like "HEY SEXY WHATUP HOW U DOIN GURL." Honestly.
The thing that scares me is that, even when you cancel your membership, your profile is STILL THERE. I kept getting messages after I cancelled...all because I didn't freakin' click the little option to make my profile invisible. You'd think cancelling your membership would automatically indicate that you don't want people looking at your profile. Apparently not.
Bottom line: I'm sharing your "Grrrrrr." I'm sharing the hell out of it....