This happened using 201605 version of adwords api nuget for .net
var adGroupAdService = (AdGroupAdService)user.GetService(AdWordsService.v201605.AdGroupAdService);
response = adGroupAdService.mutate(operations);
we made a single call and there were 55 operations provided but 110 ads have been created.
We believe it was a problem on Adwords api side.
Could anyone explain why this has happened?
we could provide more details in private