Klaus, which model are you using?
The W.E. standard vise models include the WE100, WE120, and WE60. For these standard vise models, when setup in the normal user’s orientation, the fixed or stationary side of the vise is positioned to the left side and the floating or moving side, is to the right with the knife pointed away from you to the rear.
By design the standard vise may cause a flat ground or full flat ground blade to clamp slightly off vertical with a blade lean or offset towards the fixed vise side. This clamping lean can be determined then corrected or compensated for by individually adjusting each guide rod angle, separately. Your right leaning offset suggest to me that you may have your W.E. setup oriented on your work bench so the fixed side of the vise is to the right and the floating side is to the left. Either way you prefer to orient your setup, a blade lean is common with the standard vise models and easily corrected for.
Some users prefer to use shims placed then clamped between the knife sides and the vise to overcome the lean so the clamped blade stands vertically.
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