Cookie domain scope

Hi.

I'm not an expert user of the plugin, so I might be missing something obvious, apologies in advance.

Our drupal site runs on www.domain.com

We have other sites under domain.com, eg www2.domain.com, www3.domain.com

When www2 sets a cookie onto domain.com, the plugin on www.domain.com deletes it.

How can we ensure that the plugin does not delete the domain.com cookies but only www.domain.com?

Thanks.