My phone keeps showing ' instead of an apostrophe on certain apps?

I have an iPhone and recently a coupe of my apps have been showing my received messages with the code "'" instead of its apostrophe. I know this is the code for an apostrophe, but this is only happening recently. Any ideas?

Phones and computers and other phones do not play nice when they interchange data. It sounds like either some software was updated (I think Iphones did this recently) or some software has a glitch. There's nothing you can do until everyone gets on the same system. YA had a similar problem a while back with older phones.