Split Axle Weight on a 5 Axle?.... Why?

Ok, I pull up to the scale at a Loves the other day & a Melton flatbed was just pulling on the scale. I waited.... & waited... & waited... for at least 5 minutes. So, I pick up the mic & ask the Melton driver; "They not answering the scale in there?".
No answer.
So, I wait.... & I wait. For maybe a couple of more minutes. So I ask again; Melton, they not answering the scale?
No answer.
I wait maybe another minute & I get out & walk up to his truck thinking; well, maybe he pulled on the scale & died. There he was up in there & was just about to pull forward when I asked him; they not answering the scale in there? He said, yeah, but I need to get a split axle weigh." I'm thinking, uh you do know that these cat scales will weight a 5 axle truck on one weight right? But, I didn't say anything, I figured he knew something I didn't know. So, I watched him pull up just enough that his steers & the front drives (not the rear drives, just the front) were off the scale. The rear drives & the trailer axles were still on the scale.

I'm totally confused.

So, when I went inside to get my scale ticket, this driver was in there getting his scale ticket. He looked over both scale tickets & kinda gave a disgusted laugh & said something I didn't quite hear. Again, I left it alone but was awfully curious.
When he walked out I asked the lady at the fuel desk what the deal was with this guy. She said he needed a split axle weight. She didn't know how to do that so the hold up was trying to get a manager that knew how to do this. She added that after all that, he weighed more on his 2nd weigh than on his first, so he was disgusted. (Huh?) He didn't understand how he could weigh more on the 2nd ticket than the first. (When I left after a while, he was out on the phone talking to someone... about his weight I guess)

I thought to myself, I don't understand any of this. It was just a 3 axle (steers & drives) truck & flatbed (2 axle) with something under a tarp right in the center of his trailer.
Why would he need to scale split axle when the scale weighs each "set" of axles & why would he scale with only one set of drives & both trailer axles on the scale? (Note: the only scale he got was the above mentioned split & entire tractor/trailer weight... no other weight)

 

It wasnt a spread axle... I don't think. I didn't notice it being a spread axle. But he wasn't just weighing the trailer axles. He was weighing one drive & both trailer axles.

Just to add as well, I do have a couple of customers that I go to that have either just one, small scale or one long scale that doesn't weigh each axle, so I do understand sometimes in those situations you/I need to weigh each axle but that wasn't even close to what this guy was doing.

Further, one the face, I have no idea what his intent was but, that doesn't mean anything cause I am not that experienced in that sorta stuff, so I understand, like I said in the OP, he's gotta know something I don't but, Its awfully curious to me.