Scrollbox widget moves much slower when using a gamepad

Using the gamepad to scroll a scrollbox causes the scrolling to move slower.

Tested in 4.18.3(CL - 3832480), 4.19.2 (CL - 4033788), 4.20.1 (CL -  4233996), 4.21 (CL  - 4245542)

1. Download and open the attached project
2. PIE
3. Use the mouse wheel to scroll the scrollbox
4. Use the keyboard to scroll the scrollbox
5. Use a gamepad to scroll the scrollbox

Expected: The scrollbox would scroll the same speed when using a gamepad as it does when using a keyboard.

Result: The scrollbox moves much slower than scrolling with a keyboard.