Scikit-learn version incoherence with Anaconda

Question

I am using JupyterLab for a project. I exported the virtual environment on another computer. But I can't get the right version of Scikit-learn working on the other PC.

In Anaconda Navigator, it says that the version of sklearn is '0.21.2' (which is the version I want to have). But in JupyterLab or in the Python shell of the environment, it says that the version is '0.20.3'.

I reinstalled Anaconda, but it didn't help.

Any clue on what the problem can be, and how to fix it ? Thank you.