I mentioned this while testing weapons in outfitter on the PTS but it seems like it made it to live without being added to the known issues list, so I'll report it here as well. When you stamp a weapon in outfitter and then change your equipped weapons, the game no longer seems to know what to show your weapon damage as and displays it as 0. It also seems to affect accuracy, which is shown as 110% before stamping and just 10% after stamping, so you lose the base 100%.

Here's a screenshot showing a comparison. From my testing, I think it's just visual. It does seem to affect ability tooltips, but I think I'm doing more damage than what they show. If I'm wrong here, I'm sure that'll come up fairly quickly.