It sounds like the court recognized that you were a previous client of the firm but found that there were no issues or information from that previous representation that would create a conflict of interest in having them represent the opponent in this case. That can happen, if the matters are completely unrelated and there was no access to crossover information. If you are still concerned, then do not try to do it on your own, have an attorney look at the issue. Those are the kinds of things you would have to show at the evidentiary hearing - not just representation, but facts that would show an actual conflict.
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