open TELEMAC-MASCARET The mathematically superior suite of solvers

hello
I'm new to telemac using. and I try to use a generated mesh by someone.
I tried to save boundary condition file using janet. I wondered about something.
why for example in the numbering I find for example point 1 2 3 4 6 and can't find a point with a number 5 and when I search for a node it zooms to the area between point 4 and 6 only.
there is an error in the telemac results so I try to find it and started from the mesh.