Sleeve increase help!

Hello, I am new to the forum! I have been knitting this cardigan:
and now I am doing the sleeves. I am confused where it says to “Change to St st and inc 1 st each end of needle every 3rd row 0 times…” How does that make sense? If I continue as instructed, I should have 52 sts, but I calculated much less than that. I just don’t get it! Please help me, I am almost finished with this cardigan!

Well, you only need an increase for 1 of the sizes (I’ve already forgotten, but I think it was the 3rd one in bracket). For the rest of the sizes, you just go ahead and work the next set of instructions (every 4th row).

Someone else can verify this next part. I’m not sure if you just do the 4th right away, or if you go to the 7th (3rd row + 4th row). I always get mixed up with that…although personally I would just do it right on the 4th.