I've tried to create stacked graph for our NAS volumes, total value is about 190TB, and some items are not drawn.
Legend shows corrent values, but graph misses some items due to incorrectly calculated max Y value. I've played with removing items, max value shown on graph is about 130Tb.
Manually specifying fixed graph max Y value 219902325555200 (=200T) works OK, but only in preview mode, when graph is saved and reopened, it turns to 999999999999.9999 (I guess it's a database limit on field)