After adjusting the string height, the 1st to 3rd strings are buzzing. What could be the issue?

I bought a Music Man Majesty and took it to a shop, but the 6th string was about 2.5mm and the 1st string was about 2.2mm. (I asked them to lower it, but is this really what they meant?)

Feeling like I wasted my money, I adjusted the neck myself while watching YouTube tutorials (set the 6th string at the 1st and last frets, and measured about 0.3mm at the 12th fret).

Then I set the string height to 1.25mm for the 1st string and 1.5mm for the 6th string. However, the buzzing on the 1st…

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