Extra Omen of the Sea trigger
My opponent played Yorion and exiled their Temporary Lockdown and Omen of the Sea. They re-entered the battlefield and my opponent resolved the Lockdown's trigger first, with the omen trigger below it on the stack. After the lockdown trigger resolved, I bounced the lockdown with Brazen Borrower's adventure. Then, an additional copy of Omen of the Sea's trigger appeared on the stack. My opponent scry+drew twice.
Play Yorion and exile Temporary Lockdown and Omen of the Sea
Omen of the Sea and Temporary Lockdown re-enter the battlefield, Lockdown's trigger is on the top of the stack, with Omen's trigger below it.
After the lockdown trigger resolves, bounce the lockdown with Brazen Borrower's adventure
An additional copy of Omen of the Sea's trigger appears on the stack for no discernible reason.
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[Deleted User] commented
Omen entered (one trigger), left due to Lockdown, then entered again (second trigger) when Lockdown left. Nothing wrong here.