The bio bug works like most bugs in the game, if you enter another map, the information is gone, so you must make sure you save it.
To make things simple.
Join the game
The first map you're in, write the bio without going anywhere
Disconnect
And rejoin again
Look at the bio and you will notice it's there, and it will be visable for you in the first map you enter. The only way it wont be would be if you started edit the bio in the 2nd 3rd or whatever afterwards. As soon as you visit a new map, the bio never loads for you. So if you start writing a new bio the old one will be gone next time you start the game, neither will the new one you wrote in the 2nd map be there.
Only edit/make a bio in the first map you enter, and always rejoin to ensure it saves itself.