Problem purchasing android apps I bought humble bundle for PC, which comes with some games available on android market, played the games a bit, uninstalled, then I went to market and wanted to buy a second copy of OSMOS HD, but it still shows as purchased and I don't have it on my Galaxy S2 anymore, and yes, I cleared cache, uninstalled market updates, cleared dalvik cache, reinstalled and uninstalled game to see if it worked...I wanted to buy it again because of the easier updates, but market won't allow me.

Also, I installed another game, Generation of Chaos which I didn't pay for it, then uninstalled, did the same procedures as OSMOS HD above, and I want to buy it on market, but it still shows as purchased and will not download.

Any ideas/tips ?
The issue is that the Play Store falsely linked some apps to your account that you installed from third-party sources.  

This has been in some 3.5.x version, and now it works as expected.