That's right - that's how it should be. The user guide details the instructions, but you are now supposed to trim the plastic trip. Dial speed to 1, set depth to 6-7 mm and run the saw over some sacrificial board/ply/MDF to trim it. After that it shows you exactly where the cut will be made.
Over time, the plastic trim will wear and you will need to replace it - you also need to trim it again at that point.
I strongly recommend you read this manual:
http://www.festoolusa.com/media/pdf/ts_55_eq_us.pdf