Incorrect spelling


Incorrect spelling, explanation: this spelling is incorrect because the last consonant in submit should be doubled (submitted) when we add a suffix to the word (according to the rule we double the last consonant if a word ends with a consonant-vowel-consonant combination). Therefore submitted is the correct form, while submited is a misspelling.

Correct spelling


Correct spelling, explanation: the correct form is submitted, because the core word is submit, therefore a word ending with the consonant-vowel-consonant combination. In such a case, the last consonant is doubled whenever a suffix is added. Therefore submitted is the correct form and submit is wrong.

Definition of submitted:
verb, past form of submit, to give for approval, to post
Anne submitted building plans for approval.
You haven’t submitted your thesis yet?