How do I train my Melodic memory?

Hey guys!

So I’ve noticed something in practice lately that’s been frustrating me bad.

When I’m asked to reproduce a note or a scale in the moment, I nail it perfectly.

But if someone asks me to sing back the same scale we were doing for 10 minutes, I’m suddenly slightly off key — like I’m singing next to the note instead of on it… or I end up inventing scales nobody’s ever heard before 😭😭

I don’t think it’s a pitch issue, I think it’s more of a memory thing?

Has anyone else run into this during their training, and if so, what exercises helped you fix it? Looking forward to reading your answers!