I've never seen this particular issue happen in version 1.1.4.5.
After the update to 1.1.5.0, after disembarking from a fast jetski, the character's walking animation becomes abnormal for a while, then returns to normal thereafter. Now, maybe it's just me experiencing this, but I am unsure why it happens.
*It seems to only happen with fast jetskis, such as the Phaser and the Torpedo.
*How long the animation is abnormal seems to be connected to how far the character has traveled on the jetski before disembarking.