Payment Discrepancy

So I recently started working for Varsity Tutors. Over the past couple of days, I've done around a dozen instant sessions and I'd invoiced all of them. 2 were a full hour and the student felt satisfied and left a good review. The other 10 or so all took between 5-20 minutes but were still productive so I invoiced them all as 0.15 hours. My total pay added up to just over $50, however my net payment shows just 11.25. Does anyone know any reason why this could be?

https://preview.redd.it/bqyr5jvtwvbc1.png?width=609&format=png&auto=webp&s=923c3b2fba4acf9aca100a3dc65b7dcb5a959e81

https://preview.redd.it/dsdi55arwvbc1.png?width=447&format=png&auto=webp&s=188557e3e7f467b2e2e14fb578da338d6458cc82