Someone is making support tickets under my account

I got an email about a support ticket i didn't make. I quickly changed passwords for both support.discord.com and my main discord account.

Ten minutes later, another support ticket was made--and I can see both in my Activities.

How is this happening? I haven't clicked any suspicious links (even in the email from discord). How are they able to send tickets under my account? In my Discord app, it shows only my phone and my PC (both of which I use) as the only active devices, even though I kjnow the support account is separate. Is there a way I can secure this?

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