Data entry in a custom form using the TAB key

Does anyone know why using the TAB key to move from one input element to the next would skip over a drop down field or date picker in a custom form?
The input elements were selected in order prior to connecting the dataset but now these 2 types of elements are skipped over when using the TAB key to input data.

The data can be entered and is recorded in the database but the user will skip over them if they use the TAB key to move from one field to the next.

I am only experiencing this in one form. The first form that I created the tab key selects the drop down elements.
HELP please!

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Is there a way to program in what order the input elements sequence goes when you press the tab key ?