For one thing they're monsters, they nor players should be held by the same rules since it leads to interesting encounters in the long run. So it's perfectly intended just like a toad can pull you in with his tongue over and over as you try to run away from aggro.

I think one of the biggest factors is server lag since the servers currently doesn't always pick up on certain things like this properly which they said they have the ability to fix but it will create more server stress to do so. So as far as I can see it is indeed working as intended, just sometimes the server won't always keep up with the data to/fro and it may seem like an issue at times.