Why do created lines changes its price coordinates when near bottoms and tops?

 

After creating a line, when I move it around the chart, especially near bottoms and tops, the line gets distorted.

The angle of the line gets changed, as if the line tries to cling to that bottom / top.

I tried to understand why this is happening.

I've looked everywhere I could.

 How can I make a "fixed" line without getting changed around tops and bottoms?