Originally Posted by travelingjw
Actually, I have selected these campgrounds in exactly the same way as the others. I've even deleted the first icon and the same thing happened again.
Hard to say why it would do that. If you click on a blue/green campground ICON and select add to trip then they should not be red with letters.
If you pick a campground, or any other point, other than selecting a campground identified with a blue/green tent ICON then it will be red with a letter.
I'll guess you have saved the trip closed your browser and restarted the browser and re-opened the trip. Maybe if you haven't something would get cleared up in the trip planner and get you back on track.