I am trying to understand what the buttons:
Refresh Extract Save and Unlock do
Was searching quite a bit, but did not find anything comprehensive. Maybe because I just ad a big breakthrough on a 140km ride and my brain is cooked 
Post your BT report (Details, BT report icon next to Cycling Summary) so we can see what you mean. 
Refresh is used if you want to seed your starting signature or make a slight adjustment to current values and see what the effect is on the chart analysis.
For example, what happens to the chart if I raise my TP by 3 pts.
If you agree to the changes you can Save (lock) the adjustment and your future training applies to that “new” signature moving forward.
Extract is used if there are major discrepancies in your signature such as PP and/or TP is way off. The extract routine recalculates MPA second by second based on the values you enter to extract a new signature. You can then Save (lock).
Unlock clears the adjustment and returns the analysis and signature values to prior state.
Your locked activity history is shown under Profile Settings, Fitness Signature tab.
You can also compare your new signature numbers to this bell curve PP to HIE chart –
If you don’t agree with the BT changes you can always flag the activity.
Thanks RR. Need to play around with that a bit more.
The extract shows a too low PP and HIE. So the TP seems to be a bit too high, but I guess only 5 watts or so. The LTP in the new fitness profile is certainly too high, if that should be remotely close to LT1.
March was a slow month, with business trip and visitors, so my TP dropped from about 220 to 200. Guess I needed some time to digest the training and adaptations followed. Was pushing a 10km long segment along a bay finishing with a nasty climb. At the beginning I was not sure if I would be able to match time/power from last PB, but ended up being 7% stronger. Wow. (And this for someone at almost 47)
This is the extracted one:
This is how I tweaked it and see it more reasonable:
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