It says quota over while it still shows some 50 pending in the settings.

The message says that your account is almost out of space, but you still do have further 50 regular submissions until your account limit. You are currently at 120 of 170 available submissions.

We apologize if the message inferred that you are already out of space, that is not what the message is about. Our system is merely trying to let you know that you are relatively near to your limits, so that you can keep closer track on your submissions if you are expecting to receive a lot of them.

I hope that my explanation was clear, but please let us know if you need any clarifications and we will be happy to help. Thank you.