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If are you talking about the paintbrush there is no auto-complete feature, it must be a bug in the app. I have never encountered that problem but I'm on a Galaxy Note 10.1 running Jellybean.
I was actually using the Spray Tool; switching to the Paint Tool solves the problem!
I don't use the spray tool which is probably why I didn't notice the problem. The same thing happens when I use the spray tool. I still think it's a bug. I can't think of a reason why it would be helpful for it to function that way.
I can repro this.
To add, if you happen to make a straight line, it "closes" by going back to the beginning, so if you intended to make a light stroke, it darkens it even more when you let go.