Strange numbers above the highcharts column stacking chart

problem description

develop a column stack chart of highcharts, but when there is too much data, there are strange numbers on the top of the graph. After looking for it for a long time, I don"t know how to kill it. I"d like to ask the gods for help.

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when the amount of data is small, these numbers are not displayed, so I am confused. I don"t know how to set
. I hope you can help me tell me which configuration item can kill these strange numbers.

Apr.11,2021
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