Are you asking about the fact that the label is inset a bit from the start? I think that's there because of the fact that a textField has a background, and so having that padding there makes sense.
When you change the background of the test field to transparent (a la trying to recreate "old" material design input fields) then yeah you have a weird inset. It was posted in this slack like 100 times already and the material teams response was "we dont currently support the old style material inputs in compose"