Write the order of bond enthalpies of halogens. Why is it not opposite to that of bond lengths?

Bond lengths of halogens are in the order : F₂ < CI₂ < Br₂ < I₂ 
But the experimental bond enthalpies are : CI₂ > Br₂ > F₂ > I₂
Bond enthalpy of F₂ is very less, because lone pair - lone pair repulsions are applicable in F₂ as the bond length is small in F₂.
It was also thought, though not appropriate, that F-F bond is weak as multiple bond is not possible with no d-orbitals in the valence shell of fluorine.