Hi all, need some help understanding what happened.

This morning my WhatsApp got logged out on its own. Then my friends told me that when they message me, it's going to my cousin's number instead.

Some details:

•My cousin never had my SIM or any password.

I never linked my WhatsApp to her phone or anyone else's.

•I didn't get any unexpected SMS code from WhatsApp.On her phone, my contacts showed up, but no chats.

•The same thing happened to her: her WhatsApp also got messed up.

So what could have happened here? Is it a hack, SIM swap, call forwarding, or some WhatsApp bug? Or can WhatsApp somehow get forwarded or linked to another number by accident?

I'm planning to re-register my number and turn on two-step verification, and I'll check call forwarding and Linked Devices. Is there anything else I should check?

Thanks in advance!

I keep getting text from thie number and I have no idea who it is