Login Redirect keeps going to Gridbox Page

When I try to log into my site under a particular subscription plan, the Login Redirect keeps going to this link - https://www.starmusicawards.com/index.php?option=com_gridbox&view=editor&tmpl=component&id=
See screenshot link - https://prnt.sc/JKy9NvjwkuNg
Even though the login Menu item points to a public page using the Joomla Cassiopeia template. So the page that come up is having me login again to Gridbox from the front-end. Why is this and how can I resolve?

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