The Axis input values for SteamVR motion controllers will increase exponentially by 2 from the moment the editor starts and every time the user enters VR Mode or does a Launch On (eg. Entering VR Mode one will increase the input axis value -4 to 4, -6 to 6 etc.)
This does not occur with the Oculus Rift S
Results: The values between the two axes will be -2 to 2 (Left to Right respectively).
Expected: The values between the two axes will be -1 to 1 (Left to Right respectively).
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-86429 in the post.