Correct spelling, explanation: the word submitted is a past simple form, a past participle form and an adjective participle of the verb submit. It was created by adding the most common suffix (-ed) to the root. As you can see, submit is a regular verb, which means that its conjugation is quite simple. However, you have to be careful when it comes to one important principle: when there is a single vowel before the last (and stressed as well) consonant in a word, we have to double that consonant. That’s why submitted (with the double -t) is correct and submited is just a mistake.

Definition of submitted:
1. verb (past simple, past participle), to deliver formally
I submitted my resignation to the company.
Mark has submitted an application in two forms: electronic and paper.
2. adjective participle, accept something unwillingly
The minority in this country is submitted to the majority.
The twins weren’t submitted to their parents.

Collocations with submitted:
Some most commonly used collocations include: to submit an application, a bid, a claim, a form, an order, a request, to submit a petition, to submit a portfolio.
I submitted my application and now it’s being screened by human resources.
Citizens should involve more people before submitting a petition.
Kate submitted her portfolio to her client because he demanded it.

Incorrect spelling, explanation: you can’t spell this word as submited because this version lacks the double -t letter, which is necessary when creating a past simple/past participle form of the verb submit. Why? Because of a crucial principle in the English language: when there is a single vowel before the last (and stressed as well) consonant in a word, we have to double that consonant. Just look at other examples: travelled, stopped, cancelled. It’s important to remember that the only correct spelling is submitted.