With Sweetwater Union High School District facing state and federal fraud investigations over its chaotic finances — as well as years of unbalanced budgets — the last thing the district’s leaders should be doing is ignoring the advice and counsel of the county Office of Education. Last month, the county office warned the district that an independent audit found it was underestimating by at least $12 million how much it had to repay for borrowing sums in which money meant for a use such as facilities was used to pay for something else such as operations, including salaries. District officials have said the audit was wrong. This week, the board of the Chula Vista-based district unanimously rejected a county Office of Education recommendation it resist spending $1.8 million over five years for a new fiscal software system. County officials had offered to let the district use their software for free and also urged it to pursue a competitive bid instead of buying software used by only one district in the state. District trustees OK’d the spending anyway after hearing presentations the county said had “multiple misstatements, factual errors and misleading information.” Superintendent Karen Janney and trustees Arturo Solis, Kevin Pike, Frank Tarantino, Nicholas Segura and Paula Hall have added to the dark cloud over Sweetwater. Their behavior is inexplicable.