why did the 'info' section on my facebook profile change?

[Ana]

it used to be normal, but a few days ago when i went to my profile, a facebook thing popped up and it said something about linking info?? or something like that...and it was about my hometown and work experience sections..
at first i clicked 'don't change', but then something popped up saying that if i don't change it, i will loose information, so then i clicked okay and the format of my info section changed.
I've noticed some other people's 'info' section has changed on their profiles too, but most 'info' sections didn't change.
Basically i want to get it back to normal.
Hope somebody can help!