Upload your files either as a .fzpz (the complete part) or individual svgs (since this looks to be an svg issue.) Upload is 7th icon from the left in the reply menu and will accept .fzpz and svg files. One likely possibility is that your svgs are dimensioned in px rather than in or mm. Fritzing then guesses at the dpi value and often gets it wrong in which case the svg is mis scaled and thus not aligned correctly.
edit:
If you haven’t seen it this tutorial may help as well. If you are using Inkscape please use Randy’s schematic extension to make the schematic as it will automatically set the correct colors and sizes.
Peter