Should I assume that its optimal to never have any finger touch another string even when doing warm up drills?

I find it extremely difficult (read impossible) for my pinky finger to not touch the string below it, especially on the D, A & E strings. 

This is only the case when my other fingers are in there respected fret position also pressing down on the string. 

As you can imagine, the fingers are very spread out at this point, especially on the A & E strings. 

Is this something I should spend time correcting, or is it expected and move on? 

Thank you!