Wrong tabbing sequence

Client reported weird behavior of using TAB in form’s inputs. He expected to jump on to next one but instead of it, he landed on search field.

Video illustrates the issue - https://www.youtube.com/watch?v=L9O6ZtLbdnE&feature=youtu.be

It was caused by wrong tab index (Ctrl + Shift + T). First input had the highest index of the form so that was obviously the reason of reported behavior. Tabbing in Origam is managed with tab index values.