A door doesn't move from ajar to half-open then back to ajar then back to half-open then to fully open by itself.
Who said it kept moving? The man with the selective memory? He forgot all about it at first, then remembered it. He never noticed Russell's meal being sent back, he never heard the jokes about Jane 'relieving' him, never noticed Russell returning. Not a very reliable witness imo.
Nothing was said in the first statement except;
as everything was calm, the shutters were closed and the door to the bedroom was ajar as usual. "After that Matt returned to the restaurant."
http://www.mccannpjfiles.co.uk/PJ/GERRY-MCCANN.htmBy the 10th May he has remembered a moving door which he found strange;
bedroom door was not ajar as he had left it but half-way open, which he thought strange,
After MATHEW arrived and before KATE left, he does not recall if anyone else was absent, although it was very probable that such had happened.
http://www.mccannpjfiles.co.uk/PJ/GERRY-MCCANN-10MAY.htm