Hi Jeannie,
I am not sure exactly what is amiss, but it does seem like something is.
I am going to post the LRC definition here for others too for reference.
LRC (Large Rope Cable): Uses posts of next 4 sts indicated: Sk next 3 post sts, fptr around next post st, working over fpdc just made, fptr around first skipped post st, fptr around 2nd skipped post st, fptr around 3rd skipped post st.
When you go to make your cable, you are skipping the first fpdc, right?
For example, let's say we have 4 post sts in a row. From Left to right let's label them A B C D.
So as you are crochet across, you will come upon D First. We will skip this one since it is first. If you can, place a scrap yarn or safety pin around post of D so we know where it is. Next, you make an fptr around C, then you make an fptr around B, then you make an fptr around A. So now you have 3 fptr sts in a row. Now we need to make an fptr around D. Now D is going to be buried. But you can sort of dig it out with your hook, look for the scrap yarn or safety pin. Once you have it dug out, you work an fptr around that.
Let me know how this goes or if this makes sense?