惊现！凭空出世的蒙古语族群？父母都没有，为什么我会有？

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祖源分析报告是我的，显示31.31%的蒙古语族群。
第一张图片是我父亲，纯北方汉人。传说祖上是山西大槐树移民，后来在山东青岛即墨定居，满清时期闯关东到东北。
第二张图片是我母亲，满蒙汉混血。祖上满蒙游牧民族（有可能是博尔济吉特氏），满清入关后定居在北京通县一直至今。
我与父母公祖都在98%以上，所以确定亲生。
但问题是，问什么我父母没有“蒙古语族群”，但是我却有呢？

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