The Lightmass was wrong when I reboot my project file

Development Rendering
1

Hi, I build lighting in Production Quality, but when I reboot my project file .the Lightmass in the Scene is very wrong.

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this image is when I finish build lighting .

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126897-highresscreenshot00002.jpg1400×930 89.4 KB

126898-highresscreenshot00003.jpg
126898-highresscreenshot00003.jpg844×734 62.2 KB

this is when I reboot my project file,the lightmass is wrong