Tracker pop-up does not expand to right edge of page

• Regression

Tracker pop-up does not expand to the right edge of the page like it used to in Tiki 18x.
Conditions: this is for Plugin TrackerList in wiki pages (the pop-up works correctly in the Tracker directly)

Here is a screenshot of the regression:

NOTE: it is visible that there is plenty of room to the right for the pop-up to expand to the right edge of the page, but instead, it expands up and down, making the pop-up unusable where larger amounts of text are used.

Also, this behaviour can be seen directly on this site, on the Search Wishes wiki page - https://dev.tiki.org/Wishlist
here is a screenshot if the incorrect pop-up behaviour:

Here is a screenshot of how it is currently, and correctly, displayed in Tiki 18.4:

Thanks,
Mike

UPDATE Jan. 04, 2020:
- I discovered a deeper problem resulting from the incorrect pop-up format:

This screenshot is displaying a pop-up of an Item Link field that should be in Table format, however, each of the columns (as well as the content) is being displayed in vertical (written) format, completely unusable.

UPDATE Dec. 02, 2020:

• when there is special formatting in the text area, it spills over the text behind it like in this pic:

This bug has been demonstrated on show2.tiki.org

Please demonstrate your bug on show2.tiki.org