[support] Views Grouping Question

I have one D6 site where I have a View with Unformatted style and Row style fields and grouped on "Taxonomy: Term." It looks like I want:

<h3>Dogs</h3> Rover Spot Cleaver <h3>Cats</h3> Puffy Fluffy Snuffy

Now on a 2nd site I tried to do the same thing (same settings as above) but instead I get a look like:

Rover type: Dog Spot type: Dog Puffy type: Cat Fluffy type: Cat etc.

It's grouped by "animal type" but it appears with each row instead of being a header. The first site has no custom templates. The only difference I see is that the first site is a page View and the second is a block.

Can someone tell me what I am missing? Why doesn't my 2nd site look like the first and how can I get it to ?

Thanks!