The Navigate to tab function is not working well

As in the attached video, there is a table of contents for the book. It seems that the function to return to the table of contents after reading one page at a time does not work well. On the other hand, returning the tab setting of “Navigate to tab” to Home is fine. Is there a solution?[https://drive.google.com/file/d/10XafAzwwOth3eyO3rKkfD5JtGQaENWkX/view?usp=sharing](https://drive.google.com/file/d/10XafAzwwOth3eyO3rKkfD5JtGQaENWkX/view?usp=sharing)