Just to clarify, were both the Microsoft 365 Family and Personal subscriptions under the same Microsoft account?
Here’s what likely happened: your Family plan was canceled on May 13, but it stayed active until the end of its billing period. Then, your Personal plan auto-renewed on May 24, which caused the second charge. Microsoft treats them as separate subscriptions, so you can be billed for both if they overlap.
If your email is full and you can't accept the Family invite, you're not added to the plan, which means Microsoft still sees your account as needing its own subscription. Try clearing space or use another Microsoft email to accept the invite.
Hope it helps. Please let me know if you need further assistance.
Regards,
Arlene D.