Explain the issue you are having:

Three transparent pixels on the slider track. This happens in play/test modes but not in the editor.
https://osu-ppy-sh.tvgratuite.org/b/206091 00:49:845 (1) -
DirectX fullscreen 1366*768
Three transparent pixels on the slider track. This happens in play/test modes but not in the editor.
https://osu-ppy-sh.tvgratuite.org/b/206091 00:49:845 (1) -
DirectX fullscreen 1366*768