When you manually log an activity, that overrides any data Fitbit collected during that time. It just depends on the parameters you enter (intensity, speed, ...) and from that tries to guess if it was sufficient intensity to count as active minutes.
The bigger issue is why log the walk. Logging activities is meant mainly for times when you were not wearing the tracker. If you were wearing the tracker, it usually auto-detects the walk and automatically logs it as an exercise session.
If it is not doing this, use the Exercise App to start and end the walk to get it logged as an activity. As long as you don't log it after the fact, it uses the data that it actually measured.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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