Migrating from RoboHelp10 to Lastest Version RoboHelp22

In the new versions all topics must be in the TOC but they can be hidden so the user does not see them.

Are all your topics in the TOC as if not, that would explain the issue?

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

You should also look at Peter's Robohelp Tour, especially the section on upgrading from Classic, so you know how it is done (it's different from upgrading to a newer Classic version). There's also a few known areas to watch out for which will be useful for you.

https://www.grainge.org/pages/authoring/rh_tour/rh2022/introduction/about_robohelp.htm

It is possible but due to a lot of changes to the product in the meantime, you might need to do more manual cleanup.

Firstly, you should be able download and install a trial of the latest version (RH2022 update 1 as of 10 Mar 2023) alongside your current version. I personally would customise the installation folder rather than accepting the default, to make sure I didn't install over my existing version. (If I couldn't change that setting I would install on a separate PC, just to be safe.)

I would make sure my RH10 project was as clean as possible - clean up broken links, delete unused files, etc. Then I'd make a backup zip of the entire project, just in case.

If the cpd file exists in that version I'd then delete the cpd file and reopen the project in RH10 just to check everything still looks good. The cpd file can hide some problems and deleting it will show them up - the file is recreated when you open the project. Create a temporary folder in you project - this seems to force RH to do a full "scan" of the project and fixes some issues that affect some, but not all, projects - once RH finishes thinking you can then safely delete the temporary folder. Tidy any other problems you come across. 

Once the project is clean, try upgrading to the latest version and see how things look.

If it doesn't upgrade successfully, because it's such an old version I think you should then contact support. They might be able to help, or provide  a trial for RH2019, which would allow you to upgrade the project to the last Classic version, then to the New UI version, which should allow the project to upgrade correctly.

See your contact options at the following link. The email address is recommended as it goes to a dedicated Robohelp team. https://helpx.adobe.com/contact/enterprise-support.other.html#robohelp

I think there have been a few other people upgrading from RH10 as well, so you could search the forums to see if you can find any other suggestions from people with direct experience.