hp prime simple integration doesn't work right...

[webmasterpdx]

The thing that bothers me (and others, as I've seen this in other places too), is that this does not occur on the TI-89, TI-NSPIRE, Wolfram alpha, or any of the other integration tools. This occurs on numerous integrals....the one I specified is one of the simplest e^-ax.....is about as simple an integral as is possible. It's a continuous function (no singularities). Why is the HP prime the only device that seems to be having this problem? If you work for HP, you should please look into this....Thx
Also, the message doesn't make sense.....saying taking the integral to infinity is difficult isn't an acceptable answer.....when every other tool can do it.....!!!