Blank Message Notification in lock screen

Hello,

Since I did the update for IOS11 in my iphone 6s, whenever I received a message on my lock screen, I press to open the message, however a blank message screen goes to the top of the screen and every time I lock my phone, the blank message stays on top, not until I do a reboot it goes away, is very annoying having to either disable the lock screen notification or rebooting the phone. Any suggestions?

Thank you