Help Clock/Time on lockscreen disappears after a miscall

[mzsh92]

Hello,

I have a Samsung Galaxy S4 and whenever I receive a miscall from anyone, on the lock screen the time/clock on the top right hand corner disappears, and wont return until I clear the miscall notification.

Im just wondering if this is a well known bug or if it happens to anyone else? If not, could anybody identify the problem and provide a solution please?

Thanks