The profile for your boyfriend might have been set up by some member of the website that didn't know his true release date.
https://www.inmateaid.com/ask-the-inmate/been-wondering-why-my-boyfriend-got-to-release-date-he-got-sentence-till-june-but-then-on-his-profile-says-released-for-37-days-released-date-01-24-19#answer
Accepted Answer Date Created: March 03,2019