Thank you for reaching out to the QuickBooks Community, ellen16. I would encourage you to contact that third party to find out if there is any system issue going on or recent updates on their end. In the meantime, I would appreciate it if you check other browsers such as Chrome, Microsoft Edge, etc. or the QBO app for Windows/Mac to see if the result is the same across the board with the deposits not recording in the deposit window.
Please let me know how this goes. I will be looking out for your response. Please know that the Community and I will do our best to assist you. Until then, I hope you enjoy the rest of your day and be safe.