Select gpt4o or o1, but the response is always gpt4

I subscribed to chatgptPlus package and until a week ago, I could use gpt4o normally for internet access. But now, on the windows web side, I select the model as gpt4o or o1, but the reply always uses gpt4.

BTW, I checked that my plus package didn’t expire.

Because I realized that the networking feature of gpt4o has disappeared. When I select the model gpt4o or o1, the model used to “think” about any answer or google it for a while and then return the result to me, but now it replies to the answer immediately!

example :

But, oddly enough, I worked fine with gpt4o and o1 on my ipad app. But using the ipad for office inquiries is inefficient.

Has anyone experienced the same situation?

I want to be able to use gpt4o normally on my computer