Shaping Neck - cast off

My pattern states
Cast of 4 sts in patt , place a marker at this point , cast off 7 sts in patt

My dilemma is after casting off 4 sts I still have 1 st on my right hand needle do I use that to start the next cast off 7?
I didn’t do this and now have 1 odd stitch on my Rh needle and then the cast off 7 gap I don’t think this is correct
Please can someone help !

Welcome to the forum!
Sounds like it should be a continuous cast off with that 4th stitch marked. So yes, use that leftover stitch after the cast off of 4 to continue the cast off.
What is the name of your pattern and designer?

Oh thank you for that
It’s a Sirdar pattern 1518 hooded cardigan

Very sweet!