Methodology here is opaque but clearly not systematic. (Also, it is mixing colleges and possibly other things with K-12, which is obvious from the detail lists.)
For more reliable data, go to the BLS, which is systematic. In CA:
Elementary teachers (except special ed), mean $85,100.
Kindergarten teachers (exc. special ed) $76,450.
Middle school teachers (exc. special ed and career/technical) $81,490.
Secondary school teachers (exc. special ed and career/technical) $86,900.
(And special ed and career/technical are lower in each category.)
https://www.bls.gov/oes/current/oes_ca.htm
> Edit: Look at some of the salaries on the main page, $230K-$420K - I wonder who these teachers are in Elementary and High schools with such high salaries..
Probably bad data handling; since its deanonymized, its probably based on public employer data sets, which are often released in unstructured form and potentially listing different pay for the same employee separately; to try to deal with this, sometimes people merge records by name. Sometimes this is right. Sometimes this merges duplicated data or data for distinct but same first and last named individuals (being a CA public employee and having had family members who were, I’ve seen media (one step removed from the public release) data sets where my or other family members’ data was wrong or duplicated, and derived data sets where those errors were compounded.