It should not be a mistake. If they made an official web wallet, then they should hold up their end of hosting it properly.
If it is all gone, then this project is dead.
Did you create your key? Try loading it in a full node wallet.
There does seem to be a problem. Using web wallet also and mining, two deposits 7.6 coin and 180.5 coin, but balance only shows as 180.5, it should be 188.1 or so:
Address shuga1q33xnvuymwklt7eeqdzs6shqzh84j96gn4z5j4v (QR)
Hash160 8c4d36709b75bebf672068a1a85c02b9eb22e913
Received 7.62356166 SHUGA
Balance 7.62356166 SHUGA
Transaction: 767fd604af07663e4e5b8f3a13921233820a0580d267ad8202a52fbf6fef2734
Date: Mar-20-2024 22:09:00
Address shuga1q33xnvuymwklt7eeqdzs6shqzh84j96gn4z5j4v (QR)
Hash160 8c4d36709b75bebf672068a1a85c02b9eb22e913
Received 180.55885775 SHUGA
Balance 180.55885775 SHUGA
Transaction: 6ea5d3802d528cf217e987cec986d604e02ea6fedcefbf1b9cf43fe550819baf
Date: Mar-21-2024 6:01:54
No point in mining more if the total wallet balance is not accurate.
Another interesting point SUGAR difficulty is .00083 and SHUGA is .00099 so it's actually more difficult to mine than SUGAR coin is, plus so far seems to have no exchanges it trades on at all. It then makes more sense to mine SUGAR as it's easier and also trades in several places. I see as well, the only wallets are 64 bit windows or linux, nothing 32 bit for older machines and no Android wallet either which seems odd as it appears to be designed to be far easier to mine and made for older cpu - most of which are 32 bit.
EDIT Update : Weird, the mining pool is showing as follows:
about 7 hours ago 172.93 SHUGA
about 15 hours ago 7.62 SHUGA
It seems the web wallet is showing total balance as a deposit received amount each time a deposit is made, not the actual deposit amount in the transaction history and then total as wallet balance. Logically it ought to be saying second deposit amount was 172 and then total is 180, but shows as receiving 180 and balance also 180.