Subscription problem on YouTube

This is an error with YouTube's subscriptions lately. When i click the subscribe button under a video, it shows that I am subscribed the said youtuber's channel, but when I visit the channel and click on another video, the subscribe button is red again, as if I weren't subscribed to the channel. If I click on the Subscribe button again, it shows that I am subscribed, and if I visit another video from said youtuber, it shows me as not being subscribed again... and so on...