Logged on a different pc?

Hello, Sometimes I I just stay afk with my LoL client open. But sometimes when I click on my account, I get a message that is saying that my account has been logged on, on another computer device. Does that actually mean someone else is on my account? It is a bug? It is kind of stressing me, because I dont want my account to be broken into. Does anyone know what to do?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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