Analysis Status Column?

Good morning:
I am using version 3.2! Why is it that in the "analysis status" column I have a ? and a check mark on two different songs that were played during the same set? I have 7000 songs in my collection and swear that I analyzed every one but now I have 5000 songs that have ? in that particular column? Does this mean I have to reanalyze and will this mess up any grids that I have redone manually? Or anything else for that matter? I guess maybe I don't understand the four columns in the "preference" section?
Thx
DDJJ
I am using version 3.2! Why is it that in the "analysis status" column I have a ? and a check mark on two different songs that were played during the same set? I have 7000 songs in my collection and swear that I analyzed every one but now I have 5000 songs that have ? in that particular column? Does this mean I have to reanalyze and will this mess up any grids that I have redone manually? Or anything else for that matter? I guess maybe I don't understand the four columns in the "preference" section?
Thx
DDJJ