Taegeuk Yuk Jang #6. Many people have problems with this Poomsae for a few reasons; first, they don't do a proper roundhouse kick, which means that they don't land at the correct distance. Second, they don't end up where they should for borro.
1:20 Pay close attention to the roundhouse kick followed by the step (you must complete the step).
2:16 After the roundhouse make sure that you land in a front stance, if you don't you will not return to the correct spot.
https://www.youtube.com/watch?v=fUzMmKAKNXE