Why does one person show up as different colors in the grid?
On the grids that are not limited to ‘Period of Performance’, each person appearing on the grid (and they may appear multiple times under different projects / tasks) would have their cells reflect the same color (within a column). In other words, the person will have the same utilization per month regardless of which task you were viewing.
With period of performance, on the other hand, task 1 may last 1 day and task 2 may last 2 months and task 3 might be BOT – EOT. In that case – a user would have different colors/utilization per cell depending on the task.