Sounds like you have been entering giveaways that have been deleted then. They will still show in your "Entered" list:
http://www.steamgifts.com/giveaways/entered
All I can say is choose more wisely. It sounds like some of them may be fake or by people that have no idea what they are doing.
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like title say.
this has been happening to me for 3 weeks now - i spend my points and come back later and some of my entries are gone along with the points that was spent on them.
and no its not the case of the giveaways ending. - i checked
its happening the most on the wishlist entries.
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