This never happened to me before, but had multiple times in a couple of days now. I've messed up some easy blocks because the server & client are not in sync. A block seems to work, but the general is intercepted. All looks good, but all of a sudden the attack ends and reading the reports you notice that your attacking general got intercepted.
Or when you have to pull an attack after a camp is defeated, the first attack seems to go on forever, but on the server it's already finished and your general is attacking the second camp already.
This has cost me 1 day of rebuilding my army ! ! !