Notion keeps reordering my items in board view

I have a Kanban-style board view that is being used in a typical upcoming/doing/done setup. There deliberately is no sort applied, because we manually sort items into the order that they should be or have been completed. This previously worked perfectly.

Now, when dragging an item from a column, Notion will frequently and automatically reorder the items in that column (using seemingly arbitrary criteria). Is this a known issue or are we doing something wrong?