Status-change actions (detail panel buttons and drag-and-drop) targeted #kanban-board with innerHTML, but the handlers return the full _KanbanBoard partial including the #board-content wrapper and filter bar. Each action nested a new board inside the grid, duplicating the filter chips and collapsing the layout. Target #board-content with outerHTML instead, matching the filter bar and create-task form. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>