Dropdown value, not valid after submit

[iDzine]

In my form where I have 2 dropdown fields, I'm getting a NOT VALID message for both dropdown boxes.
Tried with a default form template, same issue.
If I remove the dropdown's both, everything is submitted.
If I remove one, same error, Not Valid for the specific dropdown field.

I also have a checkbox field and a radio field in the same form, both work without any issue.

Something to do with my craftcms install? Latest version at the moment: 2.6.2967
Or is it something in Formerly I'm missing?
Can't see why this isn't working for my site :)

Any idea?

[iDzine]

Problem solved, it seems that you have to give the exact same value to the label as to the value.
So if the label says: select this
Value has to be: select this
Including space...

Normal behavior?