How do I make My 8-Direction character run?

so, i started making a little 8-Direction project and i wanted to make my character run, i made a little event that is: If Shift is down, Set Max Speed to 400

but it dosent work! it keeps the max speed on 300, other objects can affect the max speed like

Player is overlapping water: Set max speed 150

that one affects max speed

how do i fix or make it work

worked for me... you have some other event that is cancelling it