The training may have been set up for different scenarios by your company's manager(s). In most cases, it's been configured to act as recurrent which will initiate new instances (course sessions) for your training every X period. This procedure will save your old progress and initiate new empty progress for your account.
(there may be several more configurations as well that can affect this.)
If you are unsure if you passed your training or not, check the "Results" view in your account which will always show the confirmed and saved training (located in the top menu).
If you have further questions why your training is not marked as started or finished, contact your company's manager(s).