'Popup authentication issue even after customer logged in - Magento 2

I have been working on an eCommerce website Fashion Industry in Magento2. For the last several days, I got an issue, but I am not able to overcome it. The issue is the authentication Popup is continuously showing even customer is already logged in.

More specifically, the pop will not show at the time of default login, but when I use a custom login With a mobile number, it shows popup authentication at the time of process to checkout.

For your reference, I have attached a screenshot. Please check it. screenshot



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