Yes, it is due to cross-references. Essentially, a cross-reference is pointing at a bookmarked area and it shows everything inside that (hidden) bookmark. You have inadvertently placed the graphic inside that bookmarked area and so it appears inside the cross-reference. This typically happens if you have created a cross-reference to a caption and then add a paragraph by putting your cursor at the START of that caption and pressing Enter to create a paragraph above it. You should avoid this trap by placing your cursor at the end of the preceding paragraph and adding the paragraph there instead.

Assuming the graphic is the first thing in the cross-reference, you can fix it by going to the source graphic (not the cross-reference) and...
1. Put your cursor at the END OF THE PRECEDING PARAGRAPH (ie the paragraph above the graphic and pressing Enter to create a new empty paragraph above the graphic.
2. Drag the graphic into that new paragraph and delete the paragraph where the graphic was previously sitting
3. Select All (Ctrl-A) and then update fields by pressing F9

Now go back and check the cross-references.

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Andrew Lockton
Chrysalis Design, Melbourne Australia