Hello,
I see that for this results “Connecticut” is missing as a US state:
https://nominatim.openstreetmap.org/ui/details.html?osmtype=R&osmid=14148885
https://nominatim.openstreetmap.org/ui/details.html?osmtype=W&osmid=113879418
https://nominatim.openstreetmap.org/ui/details.html?osmtype=W&osmid=839795664
https://nominatim.openstreetmap.org/ui/details.html?osmtype=R&osmid=15539417
…
It looks like some general problem with relation missing, but I`m not expert. Just reporting.
For diffrent state it is working: Nominatim Demo