Did a fresh install of Windowblinds and now I have the same issue on your skins only(Invader, Rhythm and others). But I do not get the white left column on Alpha Nebula Premium by adni18, Armor Tech by don5318 or Dark Mode by Vad_M. Also works fine with "older" skins like Venom & VOX by vStyler.
Hope this helps a little.
I use light versions mostly, so that's why I didn't notice on your skins earlier, I think.