I see submission_url under your settings choices:
Remove the submission_url from your xlsform and then redeploy your survey project. You should then be able to submit the submissions from your KoBoCollect android app to the KoBoToolbox server.
Note: You will however have to submit the one to the KoBoToolbox server manually for the submission that you made with the submission_url that is stuck in your KoBoCollect android app as outlined in the support article Manually Uploading Submissions.
