Table of Contents in Word displays captions

Looking at your screen shot, it looks like captions are based on or use the same style as Heading 1.

Try this:

1. In the lower right corner of the style gallery, click the More... button to display the Style panel.

2. Click in one of your captions. Which style is highlighted in the Style panel? It should be the Caption Style. If it is, right click on the style in the Style panel and select Modify... from the context menu. If the dialog box indicates the style is based on Heading 1, change that to None. This will unlink the Captions from Heading 1 style. Now, you should be able to modify the TOC styles that will be included.

If the Heading 1 style is highlighted when you click in the actual caption, you'll want to change that to the Caption style. If your intent was to have captions look like Heading 1, you can update the Caption style to match Heading 1 before you switch it. To do this:

1. Select the entire caption, including the paragraph mark at the end.
2. Right click on the Caption style and select "Update Caption to match the selection" from the context menu. This will cause the Caption style to be based on Heading 1, so you'll want to right click the Caption style again, select Modify... from the context menu, then select Modify... and change the Style based on field to None.
3. To change all the captions, you won't be able to do a global find/replace (you don't want to also change all your top-level headings to captions), but you can use Find/Replace to make this easy.
   1. On the Home Tab, select Advanced Find (far right end of ribbon).
   2. In the Find/Replace dialog box, click Replace tab, then click in the Find field.
   3. Now click Format button in the lower left corner and select Styles... from the menu.
   4. Select Heading 1 from the list.
   5. Click in the Replace field, then click the Format button and select Styles... again.
   6. Select Caption from the list (it may be hard to find - styles are in order used).

Your dialog box will look like this (notice the styles beneath the find/replace fields):

FindReplace

Now click the Find Next button to go to the next text that uses the Heading 1 style. If it's a caption, click the Replace button. If it really is a heading, just click Find Next to ignore it and find the next caption.

If captions are no longer styled with Heading 1, you should be able to update your TOC and all the captions will disappear. Now, you can also make a table of figures using only the caption style.

I'll get notifications if you reply, so please let me know if this doesn't work for you.