I have the same issue - it is clear that RM tracking is not updating to Ebay. It is not something you can fix yourself.
kat@ebay
A few users have reported this - I have noticed it too.
Is this an Ebay issue or a Royal Mail glitch, please?
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)