groove in the saddle

[loran333]

please could you ask these questions ;

This is the first time it happen to me. (more than 10 years with the same edge)
I have had a new edge for 1 month and half and I have some burr .

One on the high E saddle , the string break very often.
One on the B saddle , the string sound like a sitar.

1) Is it a usual thing ? (just after a month !!!)

I find a thread speaking of this problem , so I have to sand it lightly with a fine sandpaper.

2) Is there a way to protect the finish (black) around the string groove ?

3) I have some remplacement saddles , so are all the saddles the same ?
(the E,B,G,D,A,E)

sorry for these noob questions and thanks for your answers.