Reason this all happened is that I bought a drydock thinking a 6th aircraft carrier would help with planes, which of course it doesn't. I should've read into it a little more, I was lazy and paid for it.
I deconstructed 1, yes I am sure it was only 1 as I didn't even touch my keyboard to delete it, aircraft carrier which was the only one I bought. When I went to delete the drydock it wouldn't let me and said it was supporting a navy vessel.
Next issue, when I went back to the main nation screen I saw I only had 4 naval vessels when I had 8 previously. When I went to check I only had 1 aircraft carrier left.
Even after all this I tried to delete the drydock and it still tells me it is supporting a vessel, yet I only have 4 altogether.
What gives?