Issue with spending my Skill Points.

[LuigiGario]

I have had a pretty odd issue with spending my skill points. This is my second play-through and I am unable to spend both of my skills points on a single skill. I do not have any traits or flaws that effect where I can spend skill points except for dumb, but the skills I can't put points into aren't the ones I've locked. 
Every time I put 1 skill point into my guns skill which is my highest, the game acts like I just maxxed out my guns skills, with the stripped red background and all that.
Has anyone else experienced anything similar? I wasn't able to find any preexisting forum posts or reddit posts complaining about this issue.
For a bit more information my guns skill is specialized, but observation is also specialized and I can put both of my points into observation no problem.

[LuigiGario]

Just a bit more info. Firstly I've tried most of the easy fixes, restarting the game, verifying the game files, reloading both manual and auto saves from throughout my current play through ect. Second is that this issue only emerged after level 4, before level 4 I was able to put all of my skill points into guns.