Negatives are to be avoided, however they are hardly uncommon in Admin Funds and always look better with a strong Sinking Fund balance like this.
You really need to understand why the balance is negative. Did the Strata Plan have some extraordinary expenditure that has caused the issue? Were the budget recommendations accepted at the last few AGMs? Are other owners behind with their levy payments?
You and your solicitor need to look at the data extracted by your Strata Inspector to see how the situation has come about. All the information should have been extracted during the strata search. If not ask the Strata Inspector for more detail, they should understand this stuff inside out.