I have complained that the family court experts do not follow the rules of evidence at all, and most of their testimony would not be admissible if proper procedures were followed. But the family court does not follow a lot of other rules either.
And even real courts get confused about the admissibility of expert testimony. See this 2013 paper and recent followup for how the federal judges and appeals courts have refused to follow the rules of evidence for expert scientific testimony.
You would think that judges would be educated on something so basic as to when some supposedly expert witness can give an opinion on a case. I guess not.