Calendar bug

Hi!

i have a bug in my calendar....

when I try to see future dates and see what I have in that day it doesn’t show anything, only if I have “all day” event, but it doesn’t show what is the event... it shows the “all day” in gray.. I tried to turn off the iPhone several times but it doesn’t changed... 

what can I do to fix it?

without deleting the calendar..

i have important appointments there...

Hope that someone can help me..

thanks!