When you are facing issues with the capacitance value for your MLCCs being out of spec, please review the attached document from Taiyo Yuden, below.
Usually, this happens when the LCR meter cannot maintain the proper voltage during the test, or the heat treatment is skipped prior to testing.
Capacitance measurement for MLCC Class2 (X5R, X7R, Y5V, etc.).pdf (66.4 KB)