There's no way to really know for certain, why your case is taking longer, but it does make sense that they are looking into your previous case. It's possible that once they got the files together, it was kicked into another queue for a more senior officer to evaluate.
The decision will be made based on all the facts they have. We don't have those facts. We don't know what other red flags there may be. Red flags are things like marrying on the first visit, and in that region, the woman being significantly older than the man is a red flag. The bigger the age difference, the bigger the flag.