Hi KeleMaake,
An uploaded IP will not be active until you do Migrate to Production and then refresh the server cache, you may check if the data is there in Proposed state.
If you are uploading a CSV file for Untrusted IP list then you can download the report from the Rules Data Report and then remove the IP from that list and reupload the data, you need to again do Migrate to production and then server cache refresh. We have not see issue in this use case so if you are running into problem suggest to open a support case.
Thanks
Namish