Question: why the results of two BesselK function is wrong?

why the results of two BessLk function is wrong? The results I got is negative,but it shouldn't be less than zero。For the same  integration expression, I use the mathematica, can get the right results.But when use maple,with the variable value's increasing,the results ranges from positive to negative.In fact, the result I got is outage probability,it should be positive.

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