The Iranian video shows a couple bass-fishing boats surrounding the larger two US boats. The US boats were armed with several M-2's at minimum. Maybe there were other, larger Iranian ships in the vicinity?
Also, how do two US boats have "navigation problems" at the same time?
The only conclusion is "of course" they were told to stand-down. The Iranians probably captured these US sailors with a stern word and water pistol
Where was their radar/satellite support, warning about approaching vessels?