I see the same thing asking me to claim Last Pass Preium license. It does not occur consistently but may be realated to cookies. When it does show up it shows up twice, so a bonus of sorts.
The decision to even throw a modal popup in a paid customers faces, especially when a menu item exists in the side bar for a LastPass License, is beyond me. Then to have it appear twice is also confusing.
It does eventually stop appearing for some period of time, likely until the cookie becomes stale or my cookies are removed. I use GotoMyPC to help my father - behaviors like this keep me from using LastPass or any other product from this business.