Why is the result suddenly changing to latex format, how can I turn it back to normal expression?

please help!! It have been working well this month, but just this afternoon, it sunndenly changed its all answers to be like this, it seems to be Latex? I sent mant promots to get it back to normal language and normal math expression, but it doesn’t work. until I was limisted, after my accees was resumed, it still kept outputing the latex language, please help!!