apostrophes (') causing problems in search results

here's a strange one.

Like many others, I often paste material from outside sources into my WF account.  Often, when I paste something, even though it matches my chosen WF font, apostrophes actually looks different.  

Where the apostrophe usually looks like a single quote straight line (') when I type it, when I paste something external into WF, the apostrophe usually looks more styled -- like a perfect square with a little dangling serif -- a lot like a comma but higher (,)  

Ignoring the height difference, it's easy to see the difference between the two characters: ' ,

The problem is that the WF search can tell the difference also.  So if I'm searching for a word that contains an apostrophe, when I type it on my keyboard, WF will not recognize apostrophes that have been pasted into WF.  So if I type a single apostrophe ' into the search bar, I see all the apostrophes I've ever typed, and none of the ones I've pasted.   Then, if I paste a previously pasted apostrophe (still with me?) into my WF search bar, it brings up all the apostrophes I've ever pasted, and none of the ones I've ever typed.