On selection some PivotTable 'Fields' go to 'Rows' instead of 'Values'

I use pivot tables a lot.

But I cannot figure out what make certain field to go to Rows, while others to Values when I click the tick box through mouse.

Normally I always want that whatever field I select go to the Value section.

Because some don't, I have to manually drag and drop them every time.

Any way, I can customize this behavior of field?

Dont want Percentage to go to Rows, it should go to Value area like Numbers does (shown below)
BTPia.png

Following is what I want ideally, field to go to Value section, instead of Rows.
b3fOl.png

That usually means that the data in that field is not being seen as numeric. If you add it to the values area, does it sum properly? If so, then only some of it is not numeric.