The delete button is broken: it changes size when dragging/hovering (which is totally unnecessary), but then when you move to the left before releasing it shrinks again.

The download button is counter-intuitive. Instead of letting you download your tasks, it downloads the source code instead.

Double-clicking on an item does not let you edit it.

Opening the app in two different tabs simultaneously does not work. When moving tasks in one tab, the changes are not reflected in the other tab.