Welcome to the group. Introduce yourself. We like to know the members.
Where are you located, how long have you had this cancer we call lasers.
What level of experience do you have, any electronics or programing experience?
There are many people here with a hugh amount of knowledge. We could bury you in information, so we need to know where to start.
With that said. Lets start with the easy fix.
Is the mirror you replaced a front surface mirror? Meaning is the reflective surface is on the "front" of the glass instead of the back.
You can easily tell by first finding something that won't scratch the mirror like a q-tip. Then touch it to the surface that you want the laser to reflect. If you are able to "touch" the reflection of the q-tip with no gap, then you have a front surface mirror. If you have a gap, then its standard rear surface mirrors. Rear surface mirrors will cause a ghost image or fuzzy image.
I suspect you used a rear surface mirror.
Aligining a laser projector is an art form sometimes it can be challenging sometimes very easy.
By calibrating I assume you mean align all of the scanned images to point in the same direction all in a line. (not all scanned images on top of each other).
Once we determine your experience level we can try to get this thing aligned better.