Explain what you see when you scroll through the dives logged on the computer?
You should see the most recent dive first as you enter log mode. As you hit the front green button, it should scroll backwards from there. The dive numbering can be a bit confusing. They aren't numbered sequentially, so watch for that. What I mean is that if you have 6 dives logged, you won't necessarily see dive numbers 6-5-4-3-2-1.
Let's say I did two one-day trips of 3 dives each day. Let's also say the two trips were separated by enough time that the computer "cleared", meaning that my residual nitrogen dropped to zero. You will see these six dives in the log as #3, #2, #1, #3, #2, #1. The first group of three dives are the most recent and are numbered 3-2-1. The next group of three dives are the older dives and are also numbered 3-2-1.
The computer groups dives together contiguously as long as each one is in theory a repetitive dive of the previous. This occurs when you still have residual nitrogen per their algorithm at the start of the next dive.
This may all be clear to you already, but I just wanted to check. With only 6 dives on the computer it is possible that the way the dive #s work in the log is confusing you.
Another possibility of course is that the computer doesn't work and you need to return it for service.