Cavalry having trouble killing the last few enemy troops?

I've begun noticing this behavior recently where a battle seems to be taking forever to finish - but when you check, there are only a few enemy troops left who just won't die. I ride up and see a mass of my troops surrounding them but seemingly just interfering with each other so badly that the enemy is untouched. I have to recall my troops somewhere else in the battlefield and then charge them back in - or just go kill the remaining four infantry that my troops can't manage to defeat.

Is this a known problem? I've been playing this game for years and it's the first time it's been such a pain in the butt.

submitted by /u/Zarimus
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