I agree with Cody...here are a few other things to consider: the ASM won't actually block on anything while the security policy is in Transparent mode...it only starts blocking when you configure the Blocking Settings and put it in Blocking mode. Also, the default ASM reject page lists a reject notice along with a support ID number. You can configure the ASM to automatically redirect to a different URL upon a request reject, but if you just set up the ASM and didn't touch the response page configuration, it won't redirect.
I hope this helps clarify at least part of your issue!