First, the military training diplomacy actions you can take with Elmet are hella bugged. They're supposed to increase recruitment cost in exchange for free levels for heavy infantry. For me, they set the experience totals of all recruited heavy infantry from then on so far into the negatives that the unit would never go up in ranks.
Second, as you can see here and here, there's a few graphical glitches concerning Autumnbreed swords and Seelie Council's... Everything.
Many thanks for your reports, we already know about these issues and they are being worked on.