Losing buff

A couple of times when I tried to buf a friend or even on my own village buildings I lose the buff. It does not apply the buff on the building but i lose the buff. Sometimes I want to buff a building and it does not apply the to buff it a second time or even a third time I found out I buffed the building 3 time. When just have bought exspensive buff for Gems and it does not apply the buff and you lose it, it gonna be an exspensive business.

it does eventually, just suffering from server lag