On an experiment data tab page, if you select a phenotype var from one of the
drop-down boxes, the page reloads and resets the drop-down box to unset.

The selection made should be set for the reload.

Related to this, if you make two such selections on different vars and review
the checked (selected) samples, you will see that you only get the first or
last, not the union as the radio button suggests.

Furthermore, when the page reloads, you can lose your vertical position on the
page and the result is very jarring and difficult to understand.  If there was a
way to avoid the reload and only reload when the apply button is pressed, that
might be better (or am I misunderstanding the purpose of the apply button).