This can be fixed inside CC4 by:
1. Clicking on your character
2. Then, opening the edit mesh window.
3. Now, select the element tab.
4. Select the eyelash you want to move.
5. Now, use the translate gizmo to move it up/down/left or right, until you're happy.
6. Once fixed, save the character.
I also found this annoying, so I created sliders for this in my both of my 'Ultimate expressions packs' which are available on the Reallusion marketplace.
These packs comes with a long list of facial.expressions and Eyelash (and eyebrow) sliders, which make manipulated the lashes very easy inside Character Creator or iClone.
If you're interested in this product, you can find the products.here.
https://marketplace.reallusion.com/iclone/author/WHOLESOME%203D
(One pack is for earmarked mainly for male characters and the other was created for female.characers; but both have a few 'eyelash move' sliders)