Thanks for your response.

I checked and I don't have tracking on, but turning it on then off again seemed to kind of help? The captions themselves have mostly fixed in that they're not duplicating anymore, but the numbering had changed so that instead of being four of "Figure 3.18," it would have Figure 3.18-3.21. After manually deleting the superfluous captions from each figure in the body of the text and updating all fields in the document, the captions don't duplicate, but the formatting in the list of figures is completely out of wack (figure numbers are out of order, figure numbers are duplicating, and the captions are duplicating even though the figure in the body of the document doesn't show duplicated captions). This is some of the text from my list of figures:

Figure 4.23. Frequencies of the number of fractures on the internal table of the exit site (rifle samples). 91


Figure 4.24. Multiple entry points with a single shot from a shotgun. (Sample Sh1). 92
Figure 4.25. Frequencies of entrance shapes (shotgun samples). 92
Figure 4.29. Frequencies of entrance shapes (shotgun samples). 92
Figure 4.30. Frequencies of entrance shapes (shotgun samples). 92
Figure 4.31. Frequencies of entrance shapes (shotgun samples). 92
Figure 4.29. Frequency of bevelling on the internal table only, the external table only, or both the internal and external tables of the entrance site (shotgun samples). 93
Figure 4.33. Frequency of bevelling on the internal table only, the external table only, or both the internal and external tables of the entrance site (shotgun samples). 93
Figure 4.34. Frequency of bevelling on the internal table only, the external table only, or both the internal and external tables of the entrance site (shotgun samples). 93
Figure 4.35. Frequency of bevelling on the internal table only, the external table only, or both the internal and external tables of the entrance site (shotgun samples). 93

I managed to get it working. Unfortunately, I have no idea how I did it >.< Thanks for the help!