OMG I lost sleep over this issue the other day. Both myself and my husband has been married once and we got different end dates our our current marriage. I scrambled what to do. I admit I turned it I-130 online quickly and just used my phone (I normally spend days on this prior sending) and hopefully I filled via paper and had really stressful weeks prior to application, I thought I am getting too old and losing my brain. I noticed other errors too but those two were major ones coz it showed that we were divorced with each other 12 yrs or so before we got married.