According to 'QE2' by Ronald Warwick & William Flayhart III, the original version from 1985, The original stem anchor was removed following damage in an Atlantic storm in 1981, it was repositioned on the foredeck to be used as a spare. This was to replace the original spare which had been on the foredeck since building, but which was lost overboard in another Atlantic storm in 1976. The anchor position on the stem was plated over and the stem anchor never replaced.
Apparently the storm caused the anchor to be pushed back up into the bow and jammed there. Upon the removal of the stem anchor, oppertunity was taken to reinforce the bow in the area it had been.
Cheers, Andrew