Summing the max values correctly

Hi SeymaKalay,
Thank you for reaching out to the Microsoft fabric community forum. Thank you Jai-Rathinavel  for your input on this issue. 
 
After thoroughly reviewing the details you provided, I was able to reproduce the scenario, I have used it as sample data on my end and successfully implemented it.   

Dax Measure:  

Correct Total = 
SUMX(
    SUMMARIZE(
        FILTER(
            AnswersTable,
            AnswersTable[col1] > 0 &&
            AnswersTable[col2] <> "text" &&
            AnswersTable[col3] <> "text" &&
            LEFT(AnswersTable[col4], 2) = "ab"
        ),
        AnswersTable[IDcol],
        "MaxAmt", MAX(AnswersTable[Amount])
    ),
    [MaxAmt]
)


Wrong Total = 
CALCULATE(
    SUM(AnswersTable[Amount]),
    AnswersTable[col1] > 0,
    AnswersTable[col2] <> "text",
    AnswersTable[col3] <> "text",
    LEFT(AnswersTable[col4], 2) = "ab"
)

Output: 

If this post helps, then please give us ‘Kudos’ and consider Accept it as a solution to help the other members find it more quickly. 
 
Thank you.