It is very strange. A green mark that rapport is increased appears but if you check rapport state the slider stays in one and the same position. So either rapport is not increased (and green label is a bug) or green label is not a bug, but there is a bug in increasing or displaying rapport state.
And it is very easy to check - one game vs master druid in Galen normally is 2-3 minutes, so i printed the screen before, then after couple of games printed it again - no difference.