The new Humble Monthly Choice has just arrived and many users are currently using Steamgifts to create new giveaways (or to enter these giveaways). Your sync problem is probably just due to some sort of traffic jam. I think it will get better in a few hours when Steamgifts will be less used.
Edit: Otherwise you can also try to sync regularly (like every 3 min) because it can sometimes succeed after several attempts when the site is so busy (it's just a matter of luck).
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Probably because after this horrid new Steam UI change, i reverted back to the old one. So now i can't sync to steamgifts anymore. But thats ok for now I guess? any issues that could come of this?
to the curious, i used this guys instructions to revert back https://www.youtube.com/watch?v=VpNE3lNAJHU
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