Allegro does *not* have any "memory" of/for shapes. However, there are two key grid systems in Allegro: etch and non-etch. Within etch, each layer can have its own grid. I suspect you might have changed grid for either the wrong type or the wrong layer. The technique supplied by Bram is probably the easiest for moving a shape by its vertex to a new grid point. If the shape is sized oddly you might find you'll be chasing the grid around if it's too coarse.
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