i just thought it was a bit odd as they both should be about 6.
As mentioned on Huawei cabinets the DS SNRM can be lowered to help increase sync. Now it can be a 6, 5, 4 & 3dB target. Your line looks like it is on a 4dB target, though there's only a couple days data so hard to tell.
The US SNRM will be higher than 6dB when you are at max sync. This is referred to as having "spare" SNRM.