Alerts from ThankYou/Like System

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So I commented on the Invex Admin Promotions / Demotion threads congratulating all admins who were promoted. This comment was liked by numerous people. The first two people who liked the comment were Razor and Forgotten I believe. Whenever somebody likes your comment you are supposed to get an alert but I only got the alert for Razor liking my comment not Forgotten's. This happened again when Swo-Z and @"pepedoge." liked the comment, I only got the alert for Swo-Z liking it.

EDIT: Happened again on the invex couples thread. Only got alert for sir lagalot liking my comment but not for spades and jae