xyz positions crazy when importing from sketchup

hello, when i import file from sketchup in which i draw pipes or other objects with xyz on the center, then export in dae format, the pipes i draw have positions xyz i don't understand, looking like : position values = Y 551,1801   Z 36,3582     /   world values: Y 0,9235   Z 14. Can someone explain me those differences? knowing that the specific origin of the pipe is in its center, i don't get it. and sometimes y and z are inversed in the position values when they hould be similar to world (that's the case in sketchup.) Can anyone help?

Related