X offset doesn't work properly

Hi. The X offset in v 3 alpha doesn't work properly. When moving a note the lines belonging to it doesn't remain fixed. Please, see the archives attached:
17.pdf --> the original document I want to transcribe to MU
17-mu-bug.pdf --> how MU writes the E note after moving it
17- lilypond.pdf --> how Lilypond writes the E note. Lilypond does the work fine. But it a lot cumbersome.

The same bug exists in the developing version 3.0 of MU.