The reason for both of these scenarios is that the models have already been deleted from the SpectroSERVER database. This can be validated by logging on to the SpectroSERVER and using the Command Line Interface (CLI) using the following command where <MODEL_HANDLE> is the Model Handle of the model you are trying to delete:
./show models | grep <MODEL_HANDLE>
If the model has already been deleted, you will not get any results.
The most like root cause is the the models are stuck in the OneClick "cache". This happens most often after reloading a previously saved database on the SpectroSERVER system.
To resolve this issue, please close any open OneClick clients and restart the Tomcat service on the OneClick server to clear the cache. Once complete, log back into OneClick and the model should no longer be present.