Need help to check some code please

I’m looking for some help from someone who understands how scripts work.

I have a plugin which integrates a genealogy package with wp. Some of the functions of the genealogy package are not working and it appears some elements of code are either not being called or are not responding as expected.

I’m in way out of my depth and need the help of someone who can see what’s going wrong.

An example is here

You will see that the page is trying to load data which is obviously either not being found or not displayed. Lines linking the boxes are also not drawing. Strangely, the descendants page for the loads it’s data correctly, though the lines are still not drawn.

Any help gratefully received.