The SD confirmations just confirmed in the past couple of days.
So far, I've worked 65 contacts with various states and only about 2/3 have updated LOTW. The ones that haven't are IA, LA, MI, MN, AL and VT. It's still early for LA and AL, but I needed the contact in IA for Worked All States.
I don't think there's anything wrong with you working the portable operations more than one band mode. They want your Q's!
Overall my "It's been a few months apparent busted QSO rate" with W1AW/x operations is just 1-2%, higher than typical contest log checking but not by much. There is one territory that stands out like a sore thumb with an apparent busted rate of 30%. I'm not going to bother getting log corrections from HQ, I'm just going to work them again in the second round (all states are activating twice... I think the territories only once.)
If you are seeing a much higher busted rate you might double check your logging and see if it is conceivable you are uploading the wrong band, mode, or time to LOTW, by looking straight at the details of the unconfirmed QSO in LOTW. Some logging programs assign obtuse rare modes (especially things like Satellite and Cross-band modes) to QSO's because the logger authors allowed selection of a particularly rare MODE ADIF value. If the time was off by more than 15 minutes that would also result in a LOTW bust - especially check your upload if it was near the daylight savings time change (to see if manual or computer conversion may have been off by an hour there) or if you are manually converting times in the evening to UTC, that you may have converted the time to UTC but not the date.