Behind the frequent appearance of "high-priced" government procurement

Recently, the "sunshine procurement" of some local governments has frequently aroused controversy: the winning bid price for the installation of the air conditioning system in the office building of Changsha Industrial and Commercial Bureau was 1.09 million yuan, but the settlement price was as high as 8.75 million yuan, more than 8 times higher. What is wrong with government procurement which is originally intended to introduce competition and save expenditure?