Hi there
I'm seeing crazy inflated keyword volumes from Adwords KW Planner too. I keep a record of the extracts for these 300 KWs so have files going back to Sept-15
Not the same issue as with plural/singular highlighted by the other but...
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an inflated "Avg. Monthly Searches (exact match only)" number in June versus all other previous months by 6x in some cases e.g. avg monthly searches for a particular KW was 2,400 up to April and now it's gone to 14,800.
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And also, Google have also retrospectively updated each of the 12 previous months average search query volumes by keyword.
Here's an example attached. Hope you can read it
Out of the ~300 KWs I track, 40 keywords have 2x'd and higher their average monthly keyword volume. 81 KWs have increased average monthly search volumes by 50%
To me it looks like either it's either a bug (or new method) in how Google count average monthly searches or they haven't updated their KW volumes in this tool in the last 12 months.