I don't mean to dismiss this issue lightly, though it may seem I am, but here's my theory:

I think it is just a trick that your mind is playing on you.  Human brain tends to seek patterns, anywhere and everywhere.  So, when you say to yourself you want to see color blue, you will see blue everywhere.  Similarly, if you have convinced yourself that you are seeing 11 everywhere, you will start noticing 11 more frequently.  But what your brain has conveniently done is forget all those other instances where you did NOT see 11.  Makes sense?

I read that article you posted the link of.  Interesting, but quite amateurish.  He mentions "string theory" as the "theory  of everything".   As a student of physics, I believe that is incorrect.  Strings, as envisioned by the theoretical physicists in the middle of last century, are said to be the components of quarks.  Quarks, they say, are the components of electrons, protons and neutrons.  Suffice to say that nobody has seen quarks, let alone strings, or even elctrons for that matter.  But when you are in the arena of Quantum Physics, these things can be surmised.  I am not sure how he saw 11 in the "strings".

Having said that, who knows, maybe there is something behind all this.