Elytra hitting the ground doesn't cause the elytra to stop, causing weird animation in inventory screen and causes you to bounce

You also can't stop it by just taking off the elytra, and you can't use rockets

I am playing on realms if that helps

Couldn't get it to happen again to take a screenshot sorry 

I should also say I am using Forge with Optifine, but nothing like this has ever happened with anything like that before