Explanation correlating to timeline in comments.
263 camel started turn Venezuela 3, Peru 3
264 camel received 4 units
265 camel placed 4 units on Venezuela Venezuela 7, Peru 3
266 camel attacked CadZilla53 Venezuela > Peru (6,4,1) (6,4) - Venezuela lose 2, Venezuela 5, Peru 3
267 camel attacked CadZilla53 Venezuela > Peru (6,4,1) (6,6) - Venezuela lose 2, Venezuela 3, Peru 3
268 camel attacked CadZilla53 Venezuela > Peru (5,4) (6,2) - Venezuela lose 1, Peru lose 1, Venezuela 2, Peru 2
269 camel attacked CadZilla53 Venezuela > Peru (1) (5,1) - Venezuela lose 1, Venezuela 1, Peru 2
270 camel attacked CadZilla53 Venezuela > Peru (2) (4,2) - Venezuela lose 1, Venezuela 0, Peru 2
Based on the history, it looks like your opponent didn't have 3, he ended up with 2. What does look strange is you being able to attack down to zero?? So now I'm questioning that the history has got some problems?
I just looked at the animated history. It also shows that he kept 2 and I dropped to 0. During gameplay, though, I dropped to 1 and my opponent went up to 3. Since neither of the other two people playing complained that I was off my rocker, I assume they also saw the same thing.