UCAS favourites list not working

I've been trying to add some courses to my favourites list on UCAS to start a shortlist but every time I click the heart button next to the course it disappears almost instantly- has anybody else had this? It is only happening with courses as I have tried favouriting subjects/ careers which has worked perfectly fine

Have you tried clearing cookies/using a differnet browser/restarting your device?

This may be connected to a known UCAS glitch - try de-selecting the Uni and then re-adding it, as this often sorts it out.

What do you mean by de-selecting the Uni sorry? As in removing it from favourites?