GoBy Starter kit - odd starting dosage?

I am new to GLP-1s in general and decided to go with GoBy Meds for their Tirzepatide with B12. It says it is the "Absolute Injection Kit #20" "Nova via Absolute"

Everything I've read on here, people are talking about starting doses of 2.5mg. Why would mine be only 1.5? Does this seem normal?

Wks 1-2: Inject 9 units (1.5mg) subQ once weekly

Wks 3-6: Inject 18 units (3mg) subQ once weekly

Wks 7-10: Inject 35 units (6mg) subQ once weekly

Wks 11-12: Inject 53 units (9mg) subQ once weekly