The spellchecker in CT seems to struggle with abbreviations.
CT marks the "e.g" of the English abbreviation "e.g." as unrecognised, but if you highlight it and click on it, it offers "e.g.". So it seems that CT is just feeding the first part of the abbreviation to Hunspell, which then, reasonably enough, decides that it's misspelt.
It would be great if this could be fixed!