Buy sell notification lines

I have noticed that if I set a buy notification, it doesnt matter if either buy line or sell line hits, the notification triggers. This is the same for the reverse of a sell notification.

Either I am doing it wrong, or could the notification only trigger for the type, when the actual buy or sell line hits.
(I have noticed, that if I have only the sell line shown, it works as expected. If I have both buy and sell, it seems to trigger regardless)