Are you using the latest beta app or the older, Lite client?
If I recall correctly there was a lottery which holders would be able to host a Sentinel node and I think a 1000 were picked?
Does Keplr have any "report a bug" features? Might be worth it to let them know
If I put Elon Musk's face in it will you believe I'm him?
Try https://app.emeris.com/ ?