Please provide a "Minimal Working Example" (MWE) that will reveal your problem.
In particular, the first few lines in chapter 5 and the preamble.
\documentclass{report,book}
your preamble
\begin{document}
Your minimal code showing your problem.
Those correct typesetting codes do not need to show in here.
In particular, the first few lines in chapter 5 and the preamble.
\end{document}