PLAYER moved wrongly means the player went inside a block. It can happen when it lags, and the block change doesn't get sent to server, so it replaces it in the client, when the player is inside the block. That also causes the "Cant keep up"

Illegal stance should mean that a player has gone below bedrock level, but i don't really know.
And for the last ones, the client could not send any info to server, so it disconnects