Incline Support Reactions Sign Convention

Hi,

I'm modelling a circular silo and assign incline supports and compression only(KFX) supports, but half of the tank support reaction results into X direction is Positive(+) and the other half support reactions into X direction is Negetive (-).  Can someone please explain the support reaction in the incline supports is also along Global axis? or towards the point that we define for incline supports? 

If its along Global axis, what is the point that we define incline supports?

Thank you

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