Dragging & dropping issue between columns results in wrong issue being moved

Steps to reproduce

1. Start using boards in a project with the default columns/labels, To Do and Doing.
2. Drag an issue from Backlog into To Do.

Expected behavior

The dragged issue is the one that's new in the drop column.

Actual behavior

The new issue in To Do is not the one that was dragged. This happens unpredictably. Sometimes it works, sometimes it doesn't. Can't seem to find a pattern.