That DVD set is a bootleg. This is what you should have purchased if you wanted the DVDs. Or if you wanted the original Release of the series on DVD its always 6 disks in individual DVD cases, Even the Perfect Sessions is just a box for the individual DVDs and a Soundtrack CD.
Here's the solution:
https://www.amazon.com/dp/B00NP06CYU/ref=cm_sw_r_tw_dp_U_x_SxlSCb42KRZRG via @amazon
This set has both japanese and the funimation english dub that was on toonami.