Previous credit query

No response from chat in app so posting on here.

So I had a bunch of 12 month installments on my card and decided I wanted to pay them all off so I settled the account in full for the 12 months. I now have previous credit but it also says that I’m still due to pay the interest… I’m confused do I have that much in credit or do I somehow owe interest?

Did you remember to replan the purchases