[5e] Game is continually removing damage dice from characters weapon.

I have a player who uses a magical weapon and great weapon fighting. Their damage roll would normally look like: 1d10ro>2 + 5[STR] + 2[Magic] However, we repeatedly see the 1d10ro>2 being reset to just the number 2, including mid combat after we had just fixed it, last week we had to fix it four times in the space of ninety minutes. I'm not sure if toggling on Great Weapon Master, or anything else seems to consistently cause this but I'm all out of ideas. The 2 could be coming from the ro>2 or the magic bonus as far as I know? For reference the weapon is an Ascendant Dragon's Wrath Glaive, so it's also applying 2d6ro>2 in Acid damage currently as well.

Hi Spooky,  The problem is in the equipment, not the attack.  Please go to the weapon, click the information bubble (where the weight is), then deselect the attack checkbox.  Next, make a brand new attack. That will fix the problem.  What is happening is that the equipment section can get corrupted data and that is being passed on to the attack.