I did my Rescue Diver course with the Wisdom 2. The Rescue Diver course has you going up and down a LOT. Just as I get the 'victim' to shore and EMS on the way (seconds) the instructor would declare another victim and we'd be back in the water. There were numerous short surface intervals and only the occasional few minutes at depth (25') searching for the 'victim'. Rather than showing a number of 3 minute dives I think it did something similar to what you had, except mine was up/down/up/down/up/down. I got out of the water a dozen times, i.e. a dozen 'dives', but it only showed 2 or 3 dives.
Bottom line, if you are out of the water for a short enough interval they assume you haven't had enough time to off gas anything measurable so they might as well assume you never quit diving.
Why did it say you were at 6'? I believe 6' is the point the computer commits to your diving being a dive. That is, if you go to 5' then get out of the water your computer will not register it. The programmer probably put something in the code that assumes you were always at 6' or deeper for a dive and it affected, wrongly, your situation. In other words, who every programmed the Wisdom didn't consider your dive profile.
Regardless, not crediting you for the short surface interval is safer than treating it as two separate dives.