Will SLC overpayment affect my Postgraduate Loan?

Hi everyone,
I’m hoping for some advice.
• I did a CYI (Check Your Income) for my third year, and SLC said I overestimated my income, so I owe around £2,500. This is separate from my undergraduate loan.
• I sent SLC financial evidence for my parents back in mid-July, but they haven’t updated the figure yet. The current amount is a default figure that doesn’t take my parents’ financial info into account, so I’m waiting for a recalculation.
• My Postgraduate course starts in February, and I’m worried about whether this will affect my loan application (I am applying for the maximum amount)
Has anyone been in a similar situation where SLC took a long time to recalculate an overpayment? And does anyone know how this will impact my my Postgraduate Loan application?
Thanks so much!