Have a problem with Autotune

I am trying to adopt Soft Autotune for my shows, and the main problem with it is that compared to traditional Autotune algorithms this one lets you sing the wrong note (i do not need Gridder efex) if high notes are some how corrected so lower notes are almost not corrected at all, the problem even gets worse then i change KEY to # for eg C# , it corrects not the same as in C key. I have tried to use 2or 3 or even 4 autotunes in series, it corrects bit better but still lets you sing wrong note. Gain setting is critical for autotune with lower gain it do not corrects at all. It’s very strange cause if i compare it to “traditional autotunes” looks like mine’s broken, or its just my UFX card is broken?

Did any body had same problems?