Hey @best-rest-store .
Thanks for reaching out.
I appreciate the context that you have shared with us as that is very helpful! By any chance, could you attempt to clear the cache on your browser and try logging into your store again?
In some cases, clearing the cache on your browser can fix minor issues that you may experience using the Shopify admin. If the issue persists, I would suggest trying to use a separate browser. For example, if you are using Safari - try this action on Google Chrome.
Let me know if that does the trick.