One of the issues could be your wallet's nonce value being incorrect/async, if you have faced any long "pending" transactions which got the txn as "dropped" in past then there is a high possibility to face this kind of issue. You could simply reset your account in metamask by going to My Accounts(click display picture) > Settings > Advanced > Reset Account.
Resetting your account will clear your transaction history and refresh your nonce value. It will not change the balances in your accounts or won't require you to re-enter your Secret Recovery Phrase. If you're using a script to deploy your contract you can also fetch your nonce value and add it to your transaction payload while sending your transactions
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