Overseeeng or Overseeing: How To spell?

The word Overseeeng is misspelled against Overseeing, which is present continuous of "Oversee"

Word contains consecutive vowels 'EI' in between alphabets overse & ng is misspelled as 'EE'
Wrong Spelling:  overse-ee-ng 
Correct Spelling:  overse-ei-ng 
Explore spell check of Overseeing to spell without errors.