Since you have the same source, select action you call both.
The onlu way i can think is using Menu option instead select option.
Are two different link.
This way you can click only one.
As i told, you have the same source.
You can duplicate this sheet and let one link per sheet and align sheets. This is no good since you are using floating objects and you have scroll down.
Menu is the best option.
But why am I able to click on all the columns in the table ?
URL action is by object click, not collumn click.
That's your problem.
As you have two in one graph is this what happens.