Apparently, and as the source is the DM I have my cynic's glasses on, there was quite a set-to backstage last week involving Katya and Neil the reason for it doesn't sound credible to me which is why I'm a bit "yeah, really? However, Katya does seem to be behaving a bit odd and I think the events of last year, the demise of her marriage and the working on the same show with her ex are at the root of it.
Overall I agree with the comments from everyone else here about the completely bonkers marking, no way did Chris's quickstep deserve a 9 but then I think we have another BBC favourite a la Hollins scenario.