Vanguard is showing me that my Roth contributions are counting toward the $19,000 401k maximum. I thought Roth counted towards a separate $6000 maximum.
Is my Roth not an IRA?
No, the Roth portion of your 401(k) is not an IRA.
If you want to contribute to a Roth IRA, you have to specifically open a Roth IRA account.
There are Roth 401(k) and Roth IRA.
Roth 401(k)- where you contribute from your salary - are a part of the 19000 $ 401k limit. Roth IRA are separate.
Yours seems to be a Roth 401(k)so the limit applies. You can open a separate Roth IRA and there you have the extra limit.