As you can see in the video, I'm blocking incoming throwing spear, but somehow spear managed to hit my hand through shield. You can see clearly that spear is stuck on my hand/shield and if it's stuck on hand that spear didn't care that there was a shield on the way.
I might have experienced this same issue before, but I haven't been sure because in those cases I've been using smaller shield against javelins, but in this case I'm sure there's something weird going on.