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Why does the gain of compressive strength of cylindrical concrete specimen is inconsistent

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Ma'am/Sir, I'm taking up CMT and we have observed or experiment on how does concrete gain strength over time. The 1st test(7dayconcretecuring) the specimen attain 15.78MPa compressive strength but in the 2nd test(14days) it decrease to 12.34MPa. How come it decrease? And i learn that compressive strength of concrete is increasing overtime. But the opposite happened.  Please help me answer this question ma'am/sir. Thank you.

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It could be due to the inconsistent of the concrete that could be poured. We can not create same condition when concrete is mixed. For example, whether the sand is dry or wet affect to the strength of the concrete directly.
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