The log appears above the test result, you're confusing the error message of one test with the log of the next one.

I'm still confuse, maybe my code is just long and it cause wrong things in place but thanks for solution! I'm still not good in one line code and that dissapoints me.
And thanks i know now my wrong syntax! My wrong

-50 should equal -1275

The failing test is above, not below.

Is it -5 -4 -3 -2 -1 = -15? sorry if my understanding is wrong

Read the description properly:

find the sum of all the integers between including them too and return it

So sum of numbers in the range of, and including, a and b.

Can i get some answer why i got some confusing result when i'm attempting to test it, please enlighten me.
This is the only one failed in the test.

-50 should equal -1275
Log
-1 -5 # This is the a and b
-15 # i print the sum so that i can understand why it failed

Thanks sir for your help! I really appreciate it

False should equal True
Mean that your function returned False while the test is expecting True

Also, the log for a given test appears in a box before the colored test result (at leat on my browser) so my guess is that it is in the previous test that your function is returning False while the test is expecting True.

https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#print-input

might be helpfull

Python, all i know is that all square root numbers must be fractional to 0 to become True and if not, it is False. Like this test, i make print(True) to know if the return value is really true

False should equal True
Log
1679616
1296.0
36.0
6.0
True

Fixed both. Thanks

Fixed tests too.

Would you mind to be more precise ?
Which language ?
Describe the test : what result did you expect ? what result did the test expect ?