That is normal behaviour. Now that your character is smaller, it is having a hard time “stepping up”. If you goal is to keep your world objects larger scale than the character, you may need more of a “ramp” type collision, so the player can walk up the ramp, instead of just running into the stairs. Or maybe there is a global “step up” height/angle I haven’t seen yet. When I am back from a quick break, I’ll check the engine and project settings for you.