This is related to a new feature. We are detecting the device which you are using. And if this device has a barometer we are disabling the automatic elevation calculation.
But here we have an edge case: You have a watch with Baro meter, but no elevation data has been recorded in the activity file. As no elevation data is available you are not able to manually click the elevation correction. I did this for you manually
(https://runalyze.com/activity/<activity ... egy=mapzen
We will fix this within the next 24 hours for future activities
Update: Has been fixed for future activties