Animated R15 Rigged Template Exported From Blender Into Studio Not Working

I downloaded the “R15 Rig and Attachments” from Here. I modified it to use IK and non-deform bone modifiers to assist in animation. I created a sample Jump animation that looks like in the video below:

When imported it into Studio as an FBX the R15 it looks like the following:

Can anyone explain to me why the animation plays back like this? Ive tried multiple things…

-Renamed the bone in Root>HumanoidRootNode to Root>HumanoidRootPart
-Removed IK and exported

Here are my export settings (I made sure to only export the Armature and Only Deformed bones):

I tried this FBX animation against a regular Blocky R15 rig and recieved the same results:

Please if anyone can help that would be appreciated… Im really tired of animating in studio.

looks like a problem with the rotation of the legs, have you looked into that?

At a second glance youre right rotation seems off. I was following this Youtube Video and I was under the assumption so as long as it looks fine in blender it will render correctly in the engine.

Heres an open sourced R15 IK and Non-IK Template with the jump animations. If you could check it out that’d be great. Ive lost a lot of time trying to figure this out.

R15 Rig_and_Attachments_Template_IK_Modified.Blend
R15 Rig_and_Attachments_Template_NoIK.blend