Attack Calculation

Dyson Hoover - Traveller Character Sheet

On the orange button the DM on the laser pistol is +1, but when I use the dice roller the DM appears to be +3. Am I missing something or is there an error here please?

I’m unfortunately not an expert in Traveller but looking around on your sheet I believe that your base DM is +2 which is why you’re seeing that +3 on the roll instead of just a +1. Your unarmed roll shows -2 and is evening out to a +0 as well.

Thank you, I don’t know why the base DM is +2, any ideas?
It says “+2 Insufficient Armour Skill Penalty” which I don’t understand.