Navigation Problem

If you are referring to Self-Paced Learning bookmarking, then the answer is that this does not remember the values of User Variables, only the number of the slide that the learner reached when they abandoned the session.

If your content is being delivered from a SCORM-compliant LMS and your bookmarking is being achieved with Resume Data bookmarking, then whether or not custom User Variable values are remembered depends entirely on the capabilities of your LMS.  Not all LMSs are capable in this area.

If you are stuck with either option here that does not remember the values on restarting the session, then you will need to look at persisting the User Variable data outside the learning module via another method.  With HTML5 output this can be done via JavaScript code (if you know JavaScript) or else you can achieve the same result much more easily using the CpExtra HTML5 widget.  More information about that here: Persisting Data with CpExtra | Infosemantics Pty Ltd