I made exactly the same mistake today. 2 tabling I had pocket 7's on one hand and 67s on another. A, 7, 10 comes on the 67s table and my brain for some reason goes 'set' called villain's first bet and then capped the turn. I bet the river and called a raise to be shown A 10. 'Hooray' I win I think, then look in horror as the pot goes his way. As you did, I thought software broke and had to check hand history to find out I'm an idiot.

This incident made me realise that even 2 tabling is wrong for me and have gone back to single tabling. I'm actually finding it a lot more enjoyable because I can really focus on my opponents playing characteristics rather than just their stats and make winning plays I otherwise would have missed.