First of all the Ecrypt project is is really outdated. Second you're reading the table wrong. Curve25519 gives you 128 bit of symmetric security, but the curve is 255 bit long. So from your table this compares to 3248 RSA.
Third I'm no fan of such key number tables, it's a bit arbitrary and doesn't really reflect the complexities of modern cryptography.
The paper of the designers of ed25519 specifies the design of the curve: the modulo is 2 to the 255th power - 19 (note that it's how the curve got its name), in the table you quote it's equvalent to (roughly) 3000 RSA bits:
