Custom Campaign save files goes to Scenario instead to Custom

When trying to save a game playing custom campaign, it opens save window for Custom, but whenever I want to load save file from there or try to override the custom campaign save file (like the one on the 2nd picture) I can't do that because instead in Custom window saves it goes to Scenario - which sure I can load from there, but can't override the save file (it's Custom-locked).

Specs:

Win 10 Pro 64bit, Radeon 7800 HD, 8GB RAM, low graphic settings

WftO v.2.0.7, all DLCs