Hyper Paint review: Floor paint (dark sea grey)

Hi there
Please assist we purchased paint to paint our factory floor. We did not specify any shade of grey as we wanted to stay with a standard color.
We received dark sea grey and we accepted that color as we envisaged that we use that color right through our facility
We received the paint in two batches 9 x 5 liter the first time and then we purchased three x 5 liter additional extra. This was done as hyper paint do not supply dulux paint in 25 liter containers!
We then started painting and as we continued painting we realized the paint was not consistent in color we then continued as we thought it was due to the new floor absorbing the paint
The next day after the paint was dry we noticed that there was about four different shades of grey between the two batches of paint that we received from hyper paint