As you can see in the screenshot, Chlorophyll a was the selected parameter (you can tell because it is the first graph visible). A Heidelberg sensor was clicked, which added more parameters to parameter 1. Instead of staying on the previously selected parameter, the first parameter gets selected.

A similar issue is that parameters aren't removed from the parameter boxes when sensors are unchecked.

For this to pass, the parameters selected in the checkboxes need to persist when other sensors are selected that add or remove parameters.