小程序里用户切换微信号登录，居然获取的openid是一样的？

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小程序里用户切换微信号登录，居然获取的openid是一样的？In the applet, the user switches the WeChat account to log in, but the openid obtained is the same?

In the applet, there is a regular login / logout function on the "my" page, and users can log in with micro signal. The so-called login is to ask for user authorization through getuserprofile to obtain user information. The background is simply to use the cloud function to return event to obtain openid. There are two numbers on a user's wechat. First log in with number a, return the corresponding openid, then log out, log in with another number B, return openid, and find that the openid is the same. Isn't openid related to micro signals? The openid obtained by different micro signal login should be different. May I ask you: 1 Is this normal? Or is my operation wrong? 2。 If it is normal, how can I distinguish if the user switches micro signal login? (in addition to the method of using mobile phone number as user identification)

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