That is the standard scenario for seeding torrents and is explained in the ((FAQ)).
Does it show in Activity: Queue in Sonarr?
If so, hover over the icon on the left for information on why it’s not importing.
If not, make sure it’s has the correct label in your download client. It looks like you’re using Qbit, so this might be related to an issue with Sonarr not setting the label properly in some cases.