Im a t2 and had a similar thing today, before lunch 8 then 2 hours later 7.4, and all I did was sit doing some work on the laptop. It says you're t1 so I guess as long as you feel OK then just keep an eye on it
I have noticed that before breakfast I am usually about 6.4, and two hours after an omelete with cheese and a tomato, about 5.4. I have no hunger and plenty of energy until lunchtime, so thats fine by me. It does seem counter intuitive, but so are many other things! Being type 2 I cannot say how it should be for a type 1 though.