During the previous patch I returned to eternal battlegrounds and discovered that all the walls and gates in the red keep required 6 supplies to fix the walls and 10 for each gate. I then found the same amounts were required to repair the other towers as well. Subsequently, after the release of the most recent patch, I went back to eternal battleground and discovered exactly the same thing had happened, despite the fact I had made sure that all walls and gates were at 100% before the patch was released. Its not a massive deal, but it still uses up a chunk of supply to repair it all.
Smile, it confuses people