the IRS requires m-2 line 9 to equal schedule L line 21. if they don't balance there's an error somewhere in your return. If you manually plug the number then you won't be able to e-file and plugging the number might trigger an IRS inquiry.
not only should these lines be equal but also equal to the total of ending capital on all K-1s we have no access to your return or information so we can't determine the source of the error.
from 1065 instructions for m-2 line 9
Line 9. Balance at End of Year
The balance at the end of the year should equal the total of the amounts reported as the partners’ ending capital accounts in item L of all the partners’ Schedules K-1.
