Hi Rosie,
Thank you for reaching out to the community! Just covering the basics, you are using the latest version of QBTime Mobile App on iOs' 3.40.2, is your iOS 10.0 or higher on your iPhone 12?
It sounds like there might be a bug and we can find out for sure, if you send your device logs to our experts. The easiest way to do this, would be to contact QBTime support: https://quickbooks.intuit.com/au/time-tracking/contact/
We are available M - F am - 6.30pm
Please get in touch with us directly to the support team. If you have any other questions, feel free to respond here and I will help!
Cheers,
Bowie