I've seen some comments about ideology points not always being deducted from the total available pool, and I found at least one instance of it happening.
In the following screenshots, I have 32 points available for Malevolent and the next Malevolent trait is supposed to cost 33 points. However, the game is letting me unlock the next trait, even though I am one point short. When it unlocks the trait, the available amount of points does not go down. The next time I earn Malevolent points, it goes up by the amount the game thinks it is supposed to. I have a few screenshots demonstrating the bug in action:
The game is telling me I have 32 points to spend, which is accurate. But it is also telling me I am able to unlock a tech, which I shouldn't be able to do:
That's because, it is supposed to take 33 points:
But unlock, it does:
And I still have 32 points to spend:
After settling another planet (and getting 10 more Mav points), my point total now shows 42, which means the game did indeed not deduct the points:
I don't know if this is always happening when the player is one point short, or if there is something else going on in the background, but I thought I should mention this to let the devs know about it and so other players can see if it happens in their games as well.
I haven't submitted a ticket with a save file for this yet, but I will be shortly.