Sometimes we want alignments to always to be tangent. Often times when moving alignments we want to temporarily turn off tangency so we can move the alignment were it needs to go.
To do this go into the Alignment Layout Tools, grid view.
Then change the Tangency Constraint column to something Fixed. Then you will be able to move segments without it trying to keep the tangency. Once done go back in and change the Tangency Constraint to Floating or Free to get tangency back.