Digital BW, The Print

Just received my 1160 CIS replacement cartridges after MIS sent me
incompatible ones a few weeks ago, Ive followed the instructions and
vacuumed filled my cartridges, and im letting the cartridges to settle
before testing them tomorrow, however im rather concerned over the
retraction of ink in the C&M tubes, one has retracted 7 inches, and the
other one 5, just wondering is that normal? or has there been an air leak?
(in the instructions it mentions something about ink retraction over half
way of the tubing, however that was referring to after the catridges had
been installed, which is not the case for me and the problem seems to have
occured earlier in the filling up stage)

Kevin.