This is a perplexing problem. :?? I went to the site I have found to have the most and best explanations of yarn overs including all the British terms. It is this one. A lot of reading, but if you read it with needles in hand you can learn a lot about YOs if they bug you.
After reading it again I think Melinda may be right on this, that it is two, what we would call yarn overs and here is why.
The instructions say to k2togyfwd, yrn, p2tog, k1
It doesn’t matter if you are working knits and purls together or just doing single ones. So it could just as easily say k1, *yfwd, yrn, p1. So the situation is simply a yarn over between a knit and a purl stitch. To do that we would bring the yarn to the front between the needles and then over the top and back around to the front. From the article I sited this is called by the Brits a Yfrn. If that was what they wanted they could/should have used that term. But they say yfwd, yrn. The lady at the site says a yfwd is a yarn over done between knit stitches, and a yrn is a yarn over done between two purl stitches. So I’m thinking that must require it to be a double yarn over. But… it could be weirdly written and really just want a yfrn or one yarn over.
I wonder what the next row says to do. Does it say to do something with two strands made in the last row, or only one, maybe that will help us determine what is really meant.
Yarn overs can be confusing, but they are not really hard. Don’t let them get to you. I hope we can get this figured out for you so you can continue your project.