This is probably a baseline, when you create a snapshot baselines are created in each component. There are a couple of easy ways to get you into a happy place.

First, the baseline is now "part" of you history, when you baseline we remember that point in time and you just can't take it out without deciding what to do with the change-sets it includes. So the easiest is to just deliver the baseline. That is it, then you can share that interesting point with others. There is no real harm in this.

Or, if you really want to forget about it, deliver the change-sets only, then once the Pending Changes shows that your stream and repository workspace have the same change-sets and all that is different is the baseline, then you can run the Replace With > Latest <stream name> to make your repository workspace the same as the stream. The baseline will be removed from your history.

Jean-Michel
Jazz Source Control Team