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I would say its a bug or an inproper use of the editor. A players personality does not change that much in 6 weeks.It's happened in the previous versions too. Let's see if I can dig up a few of the threads...
Here's one: http://www.fm-base.co.uk/forum/foot...ussion/99801-huge-decrease-determination.html
I'm sure it happened in FM11 too. Seem like a very rare side effect from a badly botched team talk. Either that...or an old bug that's still not fixed.