It looks to me that the list of “Captions for Figures” is something extracted for you the text you removed to make the sample file. It likely refers to figures which have been captioned (at least I hope it was not made manually). Such a list is better collected using
TOC & Index>
TOC, Index or Bibliography selecting
Table of Figures. This is preferable to manual creation because it guarantees it will always by synced with text. Also, the list of figures is consistently styled, avoiding all alignment issues with spaces.
This will work only if the captions have been paragraph-styled Figure which occurs automatically when captions are created with
Caption on an image. Also,
Caption automatically takes care of numbering, i.e. if you later insert another figure between two existing ones, they will all be renumbered to maintain consistency.
I cannot comment more without insight on the real content of the document.