Hey Angela, could you describe the issue a bit more? Are your fingers slipping down towards the body of the guitar or up towards the head of the guitar? Are they slipping off of the strings or just to another fret? Is it for a particular chord?
If you want, you could also record a quick video demonstrating the problem for the Private Facebook Group, and that would help me know exactly the issue, or if you plan to attend the live class on Friday, you can show me then as well.
You never fail until you quit!