Redis geo latitude and longitude calculation records, why the closer the latitude and longitude, the greater the distance?

the idea is that I first record several different points in redis, and then take a point as the center, get the points with a square circle, such as 500m, and sort them by distance, but find that the closer the longitude and latitude, the greater the distance. Why? As shown in figure
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Mar.05,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bdb32e-31250.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdb32e-31250.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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