Why some of my databases don’t have their tables displayed in Schema Objects box?

[Quoc Duyen Anh Nguyen]

I’m trying to backup some databases in MySQL and I noticed that, after I clicked on Data Export bar, some databases that I selected will have its table’s name displayed in Schema Objects box and some databases will not have its table’s name displayed even though I have a table in that database. So I’m wondering if there’s a way for me to make it show up?