[BUG] Not all points refunded when entries removed from multiple giveaways in short succession

I've noticed this issue a few times, but this is the first time I've definitively determined what the issue is, but it is definitively a bug:

If you are entered into multiple giveaways for the same game, and have the giveaways open at the same time in separate tabs, and remove your entries from them in short succession by Ctrl+Tabbing through the giveaways and clicking the 'Remove Entry' button, all entries will be removed, but your point balance will only be credited with the point value of one of the giveaways.

As the example which definitively proved it was an issue, I was recently entered into multiple Talisman giveaways, before I decided to purchase the Humble Bundle containing it. When I purchased the bundle, rather than wait for the Entered Games list to load, I simply performed a search for Talisman, opened all the GAs I was entered into in new tabs, and Ctrl+Tabbed between them, removing my entries as I went along. However, despite removing my entries from four separate giveaways, my point balance only increased by 15P—the value of a single giveaway.

My assumption is that the AJAX handler does not check for the giveaway code when entries are removed, and so when it receives multiple requests in short succession, it assumes those received after the first are erratic and discards them. I've tested it the other way—ie, entering giveaways in short succession—and it does not seem to be an issue there, which would be a more serious and exploitable issue. However, the presence of the bug in removing entries could still possibly be concerning from a security perspective, and is certainly a bug in need of patching regardless.

Hopefully this issue will be reviewed and patched soon.