Buggy: Not possible to reduce food points

In the App you can give points to the food you ate, so you can keep track.
But you cannot reduce those points if you accidentally gave wrong points.
You can only delete the whole day. Worse for custom food, these even cant be deleted over that option.
In the state right now the app is unusable!

Rasura about FoodTrackerPro - Daily Food Eating Log, v1.3