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var.test and bayes factors

I ran an F-test to compare the variances of two samples from normal populations with the base R command var.test. I wanted to extract the Bayes Factor (BF) from it by using the oneWayAOV.Fstat command, but I got weird negative numbers such as:

oneWayAOV.Fstat(2.5764, 72, 2)$bf # 10BF
[1] -0.5450246

1/oneWayAOV.Fstat(1.2587, 72, 2)$bf # 01BF
[1] -0.8737903

As far as I could understand, BFs should never be negative... What is happening here?

Thanks!

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