Hi Felix,
It sounds like your import might have overwritten your existing data and in some instances caused fields to be cleared out. This can happen at times if data is inconsistent or if the wrong fields were targeted during the update. In this instance I would suggest submitting a support case so that you and a Rep can do a screen share session and look at your data and see what might need to be done to get your application back on track. The rep can try to help you back track your steps to discover where the import went wrong. It may also involve getting the Application or Account Admin looped in to check in on permissions and the possibility of a restore depending on how badly the data has been compromised. You can create a new case in Quick Base if you click Help in the upper right hand corner of the page when signed into Quick Base > Manage Support Cases > + New Support Case. I would just make sure you include the name of the application where this happened and the details in the case. Thank you for your time today.