But I have seen mistakes on ESPN as well that were never corrected. For example, a few weeks ago Chicago scored 2 defensive TDs which were counted against my Lions defense, resulting in a -7 points against me. Pretty sure defensive TDs shouldn't count against the opposing defense.
I'm sure that wasn't a mistake. Again, that's probably just how your league scoring is set up. In my experience, for the record, defensive TDs always count against the opposing defense. You can argue that they
shouldn't, and you'd have a good case, but that would be something you'd have to set up in your scoring. Unless you went in and specified that the points against your defense should exclude points scored by their opponent's defense, I'm sure this wasn't a mistake by ESPN. That's how most, if not all, sites will score it unless you manually change it.
I'm not saying it's impossible for a site like ESPN to make a mistake. But they've been in the fantasy business for at least a few years and presumably host thousands upon thousands of leagues. If their website was really broken, they'd have found out about it by now and fixed it. In 99.99999999999999999999999999999999999999% of these cases, it's not ESPN's fault, it's because you set something up wrong in your league settings.