Strange behavior - Dropdown gets reset onchange

In my form (data view / new-edit of entity), there are two drop downs that are behaving strangely than other drop downs. There are NO on-change events whatsoever. Even then, when the user changes these two drop downs, the values get reset. This happens not on save, but immediately, in the UI. Any idea what could be wrong?
1 answers

Solved: The two dropdowns were using the same association but different xpath filter, so Mendix was trying to set the value in 2nd dropdown onChange of 1st, and when that wasn't possible, it reset both fields.