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同相放大的滤波器会振荡

我使用TI的filterpro软件设计了一个同相的低通滤波器,增益为G=4,发现实物和仿真输出都会出现振荡,如图

后来查资料知道,同相的滤波器增益不能大于3,否则会振荡,反相的不会出现这种情况。输出振荡的频率和滤波器的截止频率接近,这究竟是什么原因呢?不懂原理,求解?