If I read this right. I would not touch it!!
Joint account should report the same for both people!
When it comes to COs FICO treats a paid the same as unpaid & they will drop your scores big time!! if it isn't reporting to all CRAs that is better then being reporting.
When it is reported on just your DH's CR and not your's........yes incorrect reporting BUT he is being hurt by the reporting and YOU are not just leave it.