discrepancy between project LICENSE file and file preambles

Running licensecheck on the pantheon-terminal sources reveals files with the following included license preambles:

    114 UNKNOWN
     20 *No copyright* UNKNOWN
      8 LGPL (v3)
      3 BSD (2 clause)

but the project is marked as GPLv3 licensed on the project homepage and the included LICENSE file also states GPLv3 - this looks like an oversight / mistake to me.

Additionally, My Licensing Guru (@ngompa13) tells me that the file at (https://www.gnu.org/licenses/lgpl-3.0.txt) should be included as LICENSE.LESSER in the project.