A quantity of 9 appears green in a worksheet where green is supposed to mean “at least 10”. The colour looks reassuring, but it does not tell you which rule produced it. Changing the fill by hand would hide the discrepancy rather than explain it.
Read the value before the colour
Select the cell and inspect its value or formula in the formula bar. Then inspect the conditional formatting rules. In Excel for Windows, start with Home → Conditional Formatting → Manage Rules. The web version also has a rule-management pane; the layout and available controls differ by version.
Check the condition, any formula references and the range the rule applies to. A correct rule applied to the wrong rows still gives a misleading result. If several rules cover the cell, check their order and whether a rule stops later rules from being evaluated. Conflicting formats can depend on priority.
Also establish whether the colour comes from conditional formatting at all. Someone may have added an ordinary fill. A manually coloured cell does not become evidence that its value meets a condition.
Test both sides of the boundary
In a copy of the workbook, put 9, 10 and 11 in cells covered by the same rule. For a condition of “greater than or equal to 10”, expect 10 and 11 to be green and 9 to remain unhighlighted. For “greater than 10”, only 11 should turn green. This small difference matters at the exact threshold.
If the result is wrong, correct the condition, reference or applied range and repeat the check. Do not paint over the exception. Add a clear column heading, text status or legend so the meaning survives a monochrome printout and does not depend on distinguishing colours. Keep the underlying numbers visible: formatting helps readers find a result, but should not replace it.