Setting up Post Grid to serve up the search results on my site, I've found that searches that include punctuation cause unexpected results:
' = No results found
" = No results found
... = No results plus
! = Odd one. Search for "Jump!Zone" returned a result. Search for "JumpZone" returned no result. Search for "Jump Zone" returned a a result, even though that phrase without the ! does not exist within the result.
While the site is searching across Posts, Pages, and Custom Posts, the results above seem to be present across all types, not just the custom posts that are tied to another plugin.
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Interesting catch, let me check the plugin and i will fix it if need, I will let yo u know the update.