Misspelled keywords yielding different results in SERPs

Misspelled keywords with different results in SERPs

[selomelo]

I have a small sized website. Recently, I noticed a strange thing in Google SERPs while checking my webstats.

When G is searched for kw1 kw2, my site shows somewhere in page 20-22.
But when any or all of the two keywords is misspelled, say "widgat1" instead of "widget1," my site appears as #1 ing G serps.

I carefully checked my pages for any typos, and found none.
It is evident that Google spellchecks, corrects the typo, interprets "widgat" as "widget," and brings up results accordingly.

Now, my question is this: Does this mean that my site is subject to a filter for the keyphrase widget1 + widget2? Or if not, how could this happen?

Thank you in advance for your valuable suggestions.