In the latest stuff pack “The Sims 4 Backyard Stuff” there is an issue with the Lawn Water Slide where animation will not play back correctly on machines using Intel graphics chips. This issue causes Sims to deform and teleport when using the slide, it is very obvious, so if you have not noticed any animation issues when using the slide then the issue likely does not affect you.
We are working on a fix and I have attached a beta version of this fix in the form of a mod to this post.
To apply the fix, unzip the file SP08-Slide-Animation-Fix-For-1.21.37.package from the attached zip file and place it in Documents\Electronic Arts\The Sims 4\Mods
To remove the fix, just delete that file.
We will have an official fix for this issue in our next patch at which time this beta fix should be removed.
EDIT July 26, 2016: Patch 1.21.40 was released today that corrects this issue. Please update your game via Origin and delete this mod if you installed it. I have deleted the mod from this post.