Are you editing the weapon "properties" or the actual damage entry? Once a weapon is in the charsheet you need to edit the damage entry - adding to the damage type.
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I am changing the weapons Damage type not the properties, gonna upload video so you can see.
removed the video as it served its purpose.
I have seen people have video show up in the post not just a link, how do I do that? <-- figured it out they are animated GIF's
Thanks for the video, that helps to identify the issue.
Don't change the damage type within the weapon information once it has been dragged to the character sheet. Click the magnifying glass and change the damage type against the actual damage dice entry. Once a weapon is in the character sheet the information in the linked window is purely information, you need to change the action data if anything changes.
See step 5 here: https://www.fantasygrounds.com/wiki/...n_or_Implement
Oh, learn something new everyday, hehe thanks Trenloe.