I'm not sure what you mean. Probably Wayne will know, but just in case maybe you should do a video recording of your screen so we can see the problem better. If I understand correctly, you want the Y curve in the top image to look like the Y curve in the image below it, but it's not moving correctly when you introduce the values?
Yeah so basically because it's a translating walk cycle when you mirror the right foot across to the left you have to adjust the Y location curve on the foot you have mirrored to, it's explained in the technique snippets video of the course way better than I can explain it, but you move down frame 13 to 25 -1m then you move the entire curve up .5 then it's mirrored perfectly, it worked perfectly the first time I did it, then I decided to make some more adjustments, and for whatever reason it's now not mirroring correctly.
Never mind, I've figured it out, it's because I had normalize on, not sure when I turned it on, but it was on.