Seeing 11:11 Repeatedly and Also 10:10

It means when you look at the clock at those times then you remember seeing that particular time.

Most likely, you make a special mental note about the fact that you are looking at doubled numbers. When a number (or event) is given more mental attention than other numbers (or similar events), then the one given the most attention is most likely to be remembered.

Unless you give a certain time more attention, then the times existing at other instances when you look at the clock are not remembered.

If you saw 12:12 and made a mental note about what you see, then you probably would remember that, too.