I have over £50 payable in TCB
Based on your current selected transactions, you have exceeded the £50.00 annual limit that you can pay out as Tesco Clubcard points.
My last payment to tesco was £51 in June 2015. So I'm not seeing any breach of the limit.
Possibly, there is a TCB partner whose payment to Tesco rightly or wrongly does not get assessed as part of the £50 max.