why I got bad correlation coefficient if I use a wide database ??

I developed a code for the prediction, but the problem is when I work with a wide database during training I got a bad correlation coefficient.
PS:I have 7 inputs and one ouputs

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이 질문은 마감되었습니다.

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질문:

2015년 10월 9일

마감:

2021년 8월 20일

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