It is likely that @tobiasd4 has hit the nail on the head.
You are only showing recent feedback received for one purchase on this account.
Everything else is more than 6 months old.
if you don't log into your account when you make a purchase and checkout as a guest, the purchase doesn't show in your purchase history and you are unable to leave feedback.
If you find the email you got from Ebay when you bought the item, you can check if this is the case.
"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)