i think this is a case of gmail ignoring periods in your email address and applying the same rule elsewhere.
As an example name.lastname, na.melastname and namelast.name are all the same email address.
As an example name.lastname, na.melastname and namelast.name are all the same email address.
"fname.i.lname@gmail.com" is the same address as "fnameilname@gmail.com"