Had this happen to me in the beta.
Might have happened because I do have a mod enabled that increases the amount of wormholes generated per world a little.
But I've used said mod for really many times and never had this happen so far.
No matter how I tried to move the camera, jumping through this particular wormhole always made me jump out into the sea instead of the land.
Well, just RNG with the world generation I guess.