if you use Enhance Ability: Cat’s Grace on a creature that rolls initiative, does that creature lose the better roll when the spell ends?

Let’s say the caster uses Enhance Ability and chooses Cat’s Grace on themselves and rolls a 13 and a 16 with advantage on initiative, so they take 16. If the caster then loses Enhance Ability in-combat, or ends concentration on that spell, does their initiative roll revert to 13?