A/B test with user stickiness

What will happens in the following scenario?

1. The user entered your site from desktop and got variation A
2. Logged in - he'll still get the same variation A
3. The user went to mobile and got variation B
4. logged in 

Which variation he'll get?

The user will get variation B even after logging in as Stickiness and attribution are working per device.
For experience reports, those are not the same person.