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Chase sends 8-digit 2fa SMS codes, which seems excessive compared to the 6 that most other places use, but even weirder is that the first digit of them has always been the same, effectively making it a 7 digit code. Anyone know what's up with that?

That's a issuer ID, not unlike the area code on a phone number. en.wikipedia.org/wiki/Payment...

Not the card number, the random code that gets sent to my phone number when I try to log in

Dear lord, why do I reply to anything. The rationale for some universal starting number is a kind of internal consistency with regards to support and communication. Whether CC number or 2FA or any other thing.