Cable stich keeps reversing

Hi, I am new to here and the knitting journey in general. I am trying to knit my first piece with cable stitch.
All was going well, but the cable is now on the back of the knitting and I cant work out how to get it back, any help?

You probably did a RS row when you should have done a WS row. You can undo that row a stitch at a time to the beginning of it, then reknit as a WS row.