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TL431输出负电压异常

最近项目需要-2.5V基准电源,实际搭的电路输出有问题,-4V多,然后用multisim仿真与实际基本一致。
下图是输出-2.5V电压不对。

下图改变了2个电阻的阻值,输出-2.5V正常。

大家帮忙分析一下是哪里有问题?谢谢!

另外我的实际应用中,负载电阻大概在400K-1M之间。