I don't think it's common to use the solar and lunar return against each other. It's more standard to compare those charts to the birth chart. However, it may simply mean in this case that you are "reversing" in what you show the world in that particular month compared to the overall trend of the year. The ascendant is about how you appear to others and the descendant is about relationships. So whatever reversal is happening will have to do with those things and be also be affected by the relevant houses and signs.