This is really bad - like dangerous - UX! When you fill in the amount first in the pop up window to make a delegation, then fill in the which milestone field after, it reverts your amount back to the total possible, NOT the amount you just typed in.
It's super easy to go unnoticed so I think this needs attention. I can see many users failing at this step and feeling almost tricked :/
u can see me walking thru it here: