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Removing upvote in first five minutes eliminates possibility of restoring upvote later

Something like the following scenario has happened to me two or three times since I've been active on this site (and happened again today).

I read through an answer, like it, and upvote it. Then I take a closer look and realize I'm not so sure the answer is correct. I remove my upvote, which the system allows through (I believe) five minutes. Then, after thinking through what bothered me about the answer, I realize the answer actually is correct and click to restore my upvote. However, instead of recording my restored upvote, the system gives me this message:

You last voted on this answer
[x time units] ago
Your vote is now locked in
unless this answer is edited

The net effect is that I now cannot upvote an answer that I think deserves it.

I don't know if the same problem occurs with downvotes; I've only experienced it with upvoting.

This sure looks like a bug to me.