See if this helps with cuts, etc for your block. She doesn't use a ruler so perhaps you don't need that one after all.
https://www.youtube.com/watch?v=BbfjGedSIa0
This one shows the ruler.
https://www.creativegridsusa.com/products/CGRJAW5
Are you squaring up with the "skinny" side when it should be the "thick" side? Hopefully, the shop can help you with they issues.