Every time I write GPL license the spelling checker of my Mac OS X keeps to underline license in green; if I write GPL License, the spelling checker doesn't underline License.
When I hover the mouse over the word, the Mac shows a tool tip with the following sentence:
The word license may not agree with the rest of the sentence.
This happens whatever I write, even if I write The GPL license is commonly used.
If I write the GPL Licence is commonly used, the word Licence is underlined in red, and I get the suggestion to replace it with License or Licensee.
The same happens if I use licence.
What I am doing wrong?
PS: My Mac is set to use the American English as default language.