How is the EAX-mode used in EAP-PSK (RFC 4764)?
In RFC 4764, the ciphertext does not include the authentication tag created by EAX (which is treated separately); you can see this in figure 1, where they show the ciphertext (of length L) and the tag separately.

In contrast, the test vectors do include the authentication tag, and that additional length make the ciphertexts look longer.