mySQL errors from certain text characters?

I just need to be pointed in the right direction on this.
I’ve got a database set up where an author (the client) can enter text in an admin section. It then get’s inputted in the proper section of a web page.
I didn’t build the backend, it was already there when I took over. But I looked into it and everything is properly coded.

The thing is, it seems that when certain characters are used (- /,etc…)
Some of the text repeats itself into the other sections. But if i only enter basic text in the admin section, everything displays correctly.

What would cause this? I need help quick…
Thanks,