Totally agree something is amiss and you should start over. And yes, a portion of the tongue weight is distributed to the TT axles. The only real way to figure that out is as Larry says - remove the WD bars so you take that weight off the TT axles and back on the tongue.
Looking at the numbers again, I "think" your tongue weight is 1240. I come up with this as follows.
Trailer weights 8800 not hooked up to anything. 8800 would presumably be the TOTAL weight of the trailer, including axle weight, and tongue weight.
Weight of trailer hooked up to truck = 7560, which tells me approx 1240 lbs are being "distributed" to the truck axles, and the TT axles.
Problem is, not knowing how you are sitting on the scales, and what "disconnected from truck", really means. Was the tongue jack resting on the same platform as the rear axle of the truck? If so, there's no way you would know what portion of that is the trailer, and what portion is the truck, without running each one separately.
Best to start fresh.
Mike