Column 1, 2 and 3 on the form. With column 2 set to not allow multiple selections from the lookup field. It works this way,
whatever is "added/selected" from column 1 will populate the small dropdown in column 2 dynamically and what is selected in column 2
Only can select 1 option since "allow multiple select is unchecked" will populate column 3 on the bottom of the form.
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When column 2 (middle option box in the form) is changed to "allow multiple selections" like the others is when
things break and you see every item in column2's lookup. Column 3 no longer relates to column 2 as well as you can see
it too is displaying all the data from that lookup column.
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This is column 2. I would click "allow multiple values" as already set on 1 and 3 is when it breaks.
>Image may be NSFW.
Clik here to view.