I was gonna fast travelin to "Bonestrew Crest" and on the map it says cleared but when I clicked on the map to fast travelin I got this: You have not discovered this location yet. Somebody with the same problem?

Is the map icon white or black? If its black then you never "tripped" the pop up saying you discovered the location. I've had this happen a few times myself, but for it to happen very specific circumstances need to have taken place. For example: entering a dungeon that has an exit with its own map marker. If you exit at the second map marker and immediately fast travel, you might not activate the pop up saying you discovered the marker, because you never moved upon exit. But again, very rare, and may not be what your facing.

There are a two parts to this. The Fast Travel Marker and then the "Found it" Marker. These are not usually in the same place, and they are not always near the entrance to the dungeon. I had one Fast Travel marker put me in a place that was barely on the same mountain as the dungeon, but the "Found it" marker was on the other side of the dungeon, and not near the entrance.

The reason the Fast Travel marker is not near the dungeon is so you can go there and choose not to attack the dungeon right away, or get into a fight for just showing up. Anyway, with the "Found it" marker being where it is, one can enter some dungeons without the game knowing that you have found the dungeon.

Black but like I wrote: cleared. EDIT: I'm on the quest "Revealin the unseen", you should go to Mzulft, I was thinkin of usin "Bonestrewn Crest as a shortcut and from there go, to find Mzulft. Thanks for the help guys.

You may have cleared it without "discovering" it if you took an unconventional path to it. Or it just bugged out and the discovery never triggered.

Maybe you are right. The game are full of bugs, so why not. Thanks for the help.