My kenmore ultrawash dishwasher 665.15725691 is leaking slightly after it fills. The leak appears to be at the bottom on both sides.

I see that the door gasket does NOT go all the way to the bottom corner (this is by design). It seems that water might leak there but it didn't happen before so I doubt is if faulty by design.

I don't want to spend $50 for new gasket if that is not the cause.
Help?

It sounds more like a water level issue than a gasket problem. However, there may be a way to adjust the pressure on that gasket by adjusting the door hinges. I will send some manuals and you can read them and get the procedure from them, plus you can search YouTube and see a video on how to repair it. Here are the manuals: https://dl.dropboxusercontent.com/u/...%20Manuals.zip
https://dl.dropboxusercontent.com/u/...Dishwasher.pdf
https://dl.dropboxusercontent.com/u/...ishwashers.zip