Always 11 After the Hour

It means there is something about the number 11 that causes you to note it and remember it whenever you see it on the clock. That is the gist of why you're seeing it as often as you do.

You see other times on the clock that you don't remember seeing. But when it's 11 after the hour you remember seeing it.

Perhaps the number 11 has personal meaning to you. It has emotional significance because you wonder what it means. There is something about that number that makes it notable enough for you to remember seeing it when you don't remember seeing other numbers.

Why People See Certain Numbers All the Time has more information.