So between bet
98190081 and bet
98190403 SafeDice is skipping nonces from 2993 to 3030?
Having a closer look, they aint. There are bets of yours missing in your history.
98190085 has the expected nonce (2994), but is a 0 value (winning) bet.
98190091 has the nonce after that (2995), aswell a 0 value (losing) bet.
98190100 with the next nonce (2996), aswell a 0 value (losing) bet.
I'm not familiar with the site, so I don't know if they hide 0 value bets in the history by default (seems possible to me),
or if it's just a bug for you.
But right now, I don't think they are rigging your rolls.