Boat Location bug

I made a contraption to go around sharp corners with a boat on the server i play on.
Its supposed to stop my boat and launch it again but around the corner.
But when i travel with the boat on to the pistons i get stuck in the pistons or i,m behind my position.
Its supposed to stop my boat and launch it again but around the corner.
Now this only shows on my side of the screen but if someone else looks at me they see me just going the right way(they have the same when they are in the boat).
Also when i keep sailing towards the end(which not shows on my screen but i try) my boat Breaks and i,m next to planks and stick or if i leave the boat i teleport to the boat's real position.
It also seems to slightly been fixed if someone else or a dispenser puts the boat your going/are sailing in in the water.