P 967 of the user guide states:
To route ProChannel pre-effects bin or post-effects bin:
By default, the ProChannel signal is routed prior to the channel’s effects bin (pre). To route ProChannel after the effects bin (post), right-click any empty space in ProChannel and select Post-FX bin on the pop-up menu.
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You may have placed stuff in the FX-bin that you want before or after the prochannel fx's.
(For me I'd prefer to avoid the fx-bin altogether and place the a bin inside prochannel. So I'd never worry about pre and post)