It took a lot of emails and complaining before Lastpass told me that it was due to me being an Xmarks (bookmark sync service) customer in 2009! Apparently they owned Xmarks briefly. Why the charge started a few years ago they have no idea.
Despite repeated attempts to cancel the charge via Lastpass and Paypal it still happens every year. Apparently neither company can stop it - so every year I complain, get the charge refunded and have to swallow the exchange rate fees on my credit card. Maddening and leaves me with zero good will towards either of these companies.