Hello @YFdyh000 can you please tell me the steps that you followed to add the statements? Because normally, when you add multiple statements, you save them individually. No warning was shown when I tried to add the statements below.

@Greta_Doci_WMDE I clicked the "Publish" one by one in a few seconds, Then usually encounter an edit conflict warning, or overwrite. I am in China, so the network delay is a few hundred milliseconds.

See the screen recording for https://test.wikidata.org/w/index.php?title=Q109563&action=history

Oh I see, I reproduced it again and it was shown the same error message as you. Im updating the description to make it more clear when the error it is shown, because initially I thought it happens every time that you are trying to publish a statement or a property and you have multiple unsaved statement open. Thank you @YFdyh000

Wondering what's your network provider? China Mobile? China Unicorn? China Telecom?... Because it looks work for me under Great Wall Bandwidth.

China Unicom. I don't think this has an impact.