I am so confused what is going on with twitch account linking process...

To begin with, I was watching Mande and noticed a Twitch drop, so I tried to connect my Twitch with my EA account. However, after connecting and checking my EA account, there was no linking shown. So, I clicked the link button on EA.com to link my Twitch, but it showed that my Twitch account was already linked to another EA account. Here’s the plot twist: I went back to check my Twitch, and it also said that my Twitch was already connected to an EA account. So, I unlinked it on Twitch and linked it again via Twitch. When I went back to EA, I suddenly got access to a random account that already had my Twitch linked to it. I am very confused about how I got access to this and how this account was already using my Twitch to link with their account. I re-checked and confirmed that I only have one account, and this one had nothing to do with me at all, email and phone number of the account are not mine.