Problem with the Dabbler perk

[johndallman]

I have a character with Engineer (Spacecraft) at 18 [4], several other Engineer specialisations at 16 [1], and some more specialisations on the character sheet at default, which is 14. He has a Dabbler perk for +2 to defaults in four skills, including an Engineer specialisation, which is thus at 16. And that's the problem.

The description of Dabbler says:

Originally Posted by Power-Ups 2: Perks, p. 16

If a skill has an unusually generous default, you can’t raise it to the level that actual points in the skill would buy.

I hit this when the character bought up his highest Engineer specialisation, and if he does it again, things will get silly. How do we fix this?