Why does My Profile Last Online show that I'm online even though I

I just noticed that my profile last online sometimes shows that I'm still 'online' whenever I've logged off for more than a couple of hours. I just did a quick check on my desktop and mobile to see if I'm still logging in, but apparently, I'm not. It has happened twice so far. I'm not sure about times when I don't know/realize. I already changed my password the first time it happened, but I guess it doesn't work since it literally happened again today. I already sent a support ticket, but any thoughts? Picture

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