saddle pad help

Hey guys, my saddle pad recently started sloping forward. I got it in December and just recently noticed it slipping up. Only thing that has changed is we've started riding outside now that it is nice and he has lost a small amount of weight. I know they can slip from a poor fitting saddle but does anyone have any other suggestions or the same problem with this pad? Its a professionals choice smx air ride. The sweat pattern is even over the back.
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No advice but does just the opposite on one of our horses..slips back several inches and she is a little butt high...saddle fit likely the cause from what I have learned.