Strange, will take a look at the URL structuring in CB Package Builder tomorrow. As a workaround you can override the URLs under the Info tab with the following to fix this.
Code:
index.php?option=com_comprofiler&view=pluginclass&plugin=cbpackagebuilder&action=package&id=PACKAGE_ID_HERE&Itemid=MENU_ID_HERE
Replace PACKAGE_ID_HERE with the id of the package you're adding the URL to. Replace MENU_ID_HERE with the Joomla menu item id for that package. This should guarantee you end up on the right URL.