less than or equal to in codeigniter using mysql not working

I have a simple query like below:

i want the query to fetch the values which are more than or equal to 3 values and less than or equal to, but i dont get the result as i wanted, for example if i give value 12, i need values from 9 to 15, but it gives me some random values like till 25 and all, can anyone please tell me how to fix this


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