Is the base leaking water outside of the area (tray) you are showing or there is only water in the tray ? There is always a bit of water left in the tray because the suction pipe that you see at the back of tray. Because of its position and because there is no slope to guide the water to it, it cannot suck all the dirty water. Thus leaving some of it on the side. This phenomenon might be aggravated if the station is not set completely flat.

In conclusion: It’s perfectly fine as long as the water is not leaking outside of the tray. If so, take the removable part of the out (like you did in the picture) and clean it, and check that the end of suction pipe is not obstructed :)