Do you happen to be connecting via VPN? (Or some other reason that your IP you connect from changes regularly?) The only reason I can find for Discord consistently sending emails to verify login is “new login location” protection. Apparently you can also bypass this by enabling mobile (QR) 2FA.
If it’s not a highly variable IP location that your connection comes from (or a high rate of device fingerprint changing), then it would seem the algorithm of malicious behavior has incorrectly flagged your behavior as potentially problematic, which is indeed unfortunate.