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How does this halyard lead at the top of the mast? Do you also have (1) a halyard with the shackle on the forward side of the mast, and/or (2) a topping lift? If this is a third "halyard" using a block on a clevis pin at the aft end of the mast-head casting, it's probably an adjustable topping lift. If this is one of just two halyards running on the sheaves built into the mast-head casting, it sounds to me like it's running incorrectly.
Do you have a CDI roller furler (which has its own halyard) that leaves the original jib halyard for potential use with a drifter, asymmetric spinnaker, or whatever, but it should still lead to a forward shackle for that purpose. If in that case somebody decided to use that halyard as an adjustable topping lift, they would have the shackle aft, as you see it.
Dave Bristle Association "Port Captain" for Mystic, CT PO of 1985 C-25 SR/FK #5032 Passage Now on Eastern 27 Sarge (but still sailing when I can). Passage, Mystic, and Sarge--click to enlarge.
Dave the setup has a topping lift using 5/16 or 1/4" line attached on the aft stbd mast. That is what is confusing me about the second halyard "facing aft." Does a double vertical stack of pulleys leading to clam cleats just fwd of the bulkhead on cabin top make any sense *except* as a Spinaker Halyard (in which case I'd expect to see the shackle for it forward of the mast rather than aft.
Well I guess I have a good way to get barrels of rum or women overboard aboard in any case. And yes, about to install a CDI furler this weekend which as you point out has its own internal halyard, so I'll have at least two "mast protectors" if I leave everything as-is. Maybe it's a puzzle best figured out with the mast down this winter when I can see the mast top and figure out all the extraneous rigging. There was a "custom" furler made out of I think a #8 Folgers can, and it was rigged for sail this season by a "3d party" who could well have put that halyard (assuming it was for a spinaker) on "backwards" ...
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.