this has been happening for a while but my fighter has great weapon fighting but it always shows as 2 weapon fighting on my character sheet, i think i saw it once as great weapon fighting though.

and does the dice roller take the rerolling of 1 and 2 on damage into account?

Two weapon fighting is something everyone can do, that doesn’t mean your character has the Two-Weapon Fighting Fighting Style.

No, the dice roller is still in testing mode and hasn’t incorporated that level of smart rolling at the current time.