First of all, I don't know if this issue is present when using the web client on PC, but I'd imagine if it were it would've been reported her ages ago. But when I enter into a list on my phone, the "Cancel" button doesn't close the list, and the only way to close it is to back out of the web client and reopen it again. The "Cancel" button then works as it should. Hopefully this issue can be resolved soon.
Thanks in advance,