[Nugget7211]

That last one is pretty simple to explain IMO. You were on low stamina and moving, while he had high stamina, causing you to do less damage than normal. You also had low head health having just recovered from a health event, so the damage mitigation from landing first wasn't enough to save you for the knockdown caused by the overhand you were circling into.

Exchanges in this game do look weird, because everyone has Patrick Cummins/Derek Brunson syndrome, where everything that hits them lands as hard and clean as possible, but it's more of an animation thing than a mechanical one IMO

Edit: Having rewatched the first one, that's an animation thing too, sometimes the block is up mechanically before it is up visually, might be exacerbated by any latency online although I'm not 100% sure and the 2nd one looks you got unlucky by rolling during a stance switch which appears to be a legit oversight.