"Missent" typically refers to the postal office accidentally sending it to the wrong postal branch or the wrong mail delivery truck. It doesn't however mean that it’s lost. This typically resolves itself, and gets scanned as it is, when the carrier catches the mistake and from there, it should be routed correctly.
​
You can find more information on shipping scan codes here: https://about.usps.com/publications/pub97/pub97_appi.htm

Continue to monitor the package! It should still be getting delivered to you, just with slight delays.