Question on the new point system

I did a quick search but couldn't find any mention of this in the thread, I apologize if this has been asked/answered already.

I had entered a giveaway for "Rise of the Tomb Raider" (50p). Today, I decided it had too many entries and the chances were too slim for the valuable points, so I tried to leave. Being at 270 points, I got a warning saying I'd lose 20 points by doing that. 270+50=320, so I was warned about breaching the 300 point cap and therefore losing points.
So, is the new 500 point limit only enabled for "point generation" but not for "point relocation"? Is that how it's intended to work, or is that a bug? Also, what would happen if you won a game and your entries for other copies were refunded? Would you go over 300 or lose points?

I want to make sure that everyone who reads this understands that the goal here is to ask a question and raise awareness to an issue that might have been overlooked, NOT to bitch about missing points.

Thanks in advance to anyone that can shed some light on this 😎