@slothymacneal @MTGSecretLair I opened another tab and closed the secret lair one, then relaunched the site and resigned since it showed sign in for me (I previously was already signed in) then went to checkout and everything was there. Hope it works out for you!
@RedRayfe@MTGSecretLair I opened a fresh tab and exited out of the secret lair tab (scary) then I searched up secret lair again and logged into my account if it said sign in (the cards I added to my cart were still up there this whole time) then I was able to check out with the cards in the cart.