ColonelFazackerley I am gonna blame the UI for that one. I look left at the angle of the blocks, while clicking on the right to rotate them. I miss and place a block instead. then I fail to notice. hence this suggestion https://gitlab.com/box-stacker/box-stacker/-/issues/1
andy ColonelFazackerley Yep, the UI is whatever I could get working against a tight deadline, and now I'm too exhausted to fix it :-)