If you are worried, either get another test kit, or have another LFS
test it for you. But from the life in the tank you discribe I don't
think you have any problems.

Kim brings up a good point, if you're unsure about your readings, and a
local LFS says your tests are ok, go to another store and have them test
your readings. You may find out, you're reading the results wrong, it's not
uncommon, especially when you'er new to this hobby.