There's no way to delete your server on minehut- my guess is one of the following happend:
1. You accidentally clicked the Reset Server button in the Danger Zone tab, maybe you mistook it for some restart button (There's also a Reset World button in the World Settings tab, but that would only reset your world and none of your files.
2. Your server was violating a minehut rule and was deleted by an administrator.
3. Possibly you just logged in with a different account than the one you used to create the server without realizing it, saw your server wasn't there, and assumed it was deleted?
You could try contacting minehut support, but I doubt they'll be able to help with something like this.
(P.S. This post would be better fit in Community Support)