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No they don’t, you’re thinking of custom lineage
https://www.dndbeyond.com/races/1-human
Humans get +1 to all stats, which means they start with 18 on their primary. At level 4 they get 2 points like everybody else, thus maxing it out and getting a +5 mod.
How are you getting a base 17? 15 is the highest base in standard array or point buy.
Also how does your logic work? Humans get +1 but most races get +2 to an ability.
