I'm currently doing the Linked list explore card, and this is how the UI appears for me. Look at the left side in the image attached, the problems don't load up at all... I've had issues like this with almost every explore card, not just Linked list. I've also asked my friends who don't have premium account and even they have the similar issues with multiple explore cards like this.

I've tried to empty cache and hard refresh as well, even then it's still the same for many explore cards.