I'm not sure how you are creating your table of contents but here is what I do.
1) Select the menu at the bottom of the journal
2) Select Page
3) Select Edit Tab
When you create a new tab it automatically creates an entry in the TOC that is active
When you look at the journal in the Library, press and hold the journal and a circle of things will pop up. Select Table of Contents and it will list all of the tabs you created and will take you directly to whichever one you select.