The first screenshot shows what does happen: you click the ... on a task in a Board view, and the dropdown menu appears unexpectedly in the top left hand corner of the window, instead of where you clicked. You can interact with the drop-down, but it does not disappear when you have completed your interaction with it. There appears to be no way to remove it without refreshing, and it blocks interaction with any other elements. This does not occur when the task is opened and the "..." Task Settings menu is clicked.
The second screenshot shows what should happen: the dropdown should open where the user clicks, and be dismissable.
The situation does not always occur but occurs enough to be a major annoyance and time-suck due to the reloading required to escape it.