How do I fix the popups location issue?

I am working with RoboHelp 2015. I have a legacy project for chm help and there are images in the topics with  hyperlinks to other topics. The links are displayed in auto-sizing popups.

In one project, everything works just fine. When you click the hotspot, the popup opens adjacent to the image.

After generating the output (chm help), when I click an image hotspot, the popup  opens at the top left of the topic pane. Actually, the popups suppose to open adjacent to the image. 

Interestingly, the popup location issue relates only to popups called by image maps. If there are other links to popup topics in the text, they behave as expected.