Why are the blueprint so bad they never match!

Hey I’m just getting into sub-D modeling and these dam blueprints are not matching how do I fix this it’s so irritating as I am confident and want to try but they never match and it throws me off!

Maybe the blueprints are not correct or your setup is not exact.
Take a look at the link or post your blendfile / blueprint.

i’v seen a lot of free blueprint and many have all kind of problems
parts with different scale
or scale in x no the same then scale in Y
not enough cross sections
dwg too small

i mean this is how it is unless you pay for a high quality blueprint!

happy bl

Can we see the blueprints in question?