Why is the demo stacked on echart's line chart incorrect?

http://echarts.baidu.com/exam.

for example, the search engine data on Monday is 820, but it seems to have a scale of more than 1500

Jan.26,2022

stacking chart, whose value is an interval value. The current height minus the height of one.
by setting the value of series [I] .stack, you can switch to stack line or normal line

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-64f5-1bd5620-306fa.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bd5620-306fa.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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