Links w/in a popup - two types

OK, a link opens to a popup. W/in this popup is another link. This link goes to a topic, but this second topic is NOT a popup. It’s to a topic that is a file in the project that you can also get to from the TOC. In the Preview version of my project, when I click on such a link in the popup, the topic that the link represents is now displayed in the popup -a second popup does not open, nor does the OLH jump to the topic.  For example, in the Preview mode of RH, if I click Selecting an Edition, then the contents of the Selecting an Edition topic are displayed in the popup. In any browser, Mozilla, Chrome, etc., the link is dead. Nothing happens.  I have attached a graphic show this - the one on the left shows the Title Bar popup contents being replaced by the Selecting an Edition topic content in Preview Mode in RH. The one on the right shows that when I click on the link in an actual browser, nothing happens.