2 Item bug with hextech interaction

In one fight i tried to make a Shojin on my Camille . I first put Tear . Being too slow the enemy hextech ability hit my Camille as I was about to put the BF sword on. What resulted was having both half items on her at the same time. Later in the game I got another Tear and tried to make a Shojin since BF sword was the first item listed on my Camille. It kept showing a Hextech Gunblade when I hovered it over her. So I thought that was odd and used another item I had, Large Rod , to see if it would be different. It changed to another item, Shojin . Being that that was the item i wanted on her I combined and the result was 2 full items, Shojin and Ludens Echo . So to recap I got 2 full items on my Camille from 3 half items. Strange part is that it should have been a Gunblade instead of Shojin because of the Large Rod. Again this was several rounds after the Hextech interaction occurred.

Another player tried to do the same thing when I asked in chat if anyone else had the bug happen. They had an Ashe with Bow and Chainmail. and when he tried to add another Bow to her it did not work. Could not see what he got because he died and left soon after he tried.