OK, it's field blended. Deinterlacing field blended video is a last resort solution. You can do a search on "blended fields" to find alternative approaches for restoring the progressive source. I don't get into that because I vomit every time I see such things. I prefer to keep my food in my stomach.
Still, you could repost your sample in the Avisynth Usage section and there are lots of people there that get their jollies from fixing field-blended video. A longer clip with maximum motion will be preferred.
Bear in mind that true interlaced animation is very rare. Some CGI does it, but hand drawn animation is drawn as frames, not fields, so it is progressive. The problem with your source is that it has gone through a field-blending standards conversion.