Mass Effect 3 Weapon Upgrade Scrolling Bug

Just after finishing Rannoch, went to check weapon upgrade table. Scrolled down,  but as soon as the indicator goes to the next weapon off the screen,  it resets to the top again,  forcing me to scroll all the way back down to look at the next weapon in the list. I've picked up a fair amount of weapons, only upgraded maybe 3, and only one to level 5. Scrolling up has similar bug. It moves the list up,  then drops the indicator back to the second weapon,  then moves up,  scrolls up, repeats. 

Pressing down one at a time doesn't help. 

Playing the most recent patch, Legendary edition, on PC.