To both parts? That obviously contradict each other, hmmm. The only thing I can suggest is closing the character sheet and opening it again and if that doesn't work restarting the tab the game is in. If it's still not fixed after that post a reply here https://app.roll20.net/forum/post/5576582/5th-edition-ogl-by-roll20-v2-dot-0
saying that the sheet is auto rolling damage when you've set it not to and hopefully a dev can fix the issue soon. If it works for your other sheets I would recommend using the method I showed before to get the Row ID for the weapon. However, for the character it's not working for, for each weapon you will have to right click on the weapon and select "Inspect" and then look for a little bit of code that looks similar to this <div class="repitem" data-reprowid="-KC0zCLum1Rq3V5wssyE"> when you scroll your mouse over this line of the code the row with your weapon should get highlighted. This will confirm it is the Row ID for that weapon and you can get it that way. You can then do this for each weapon in the characters sheet. As for the character ID you can get that through the same method of right click inspect but right click on the 'background' of the sheet, i.e not any of the fields. This should highlight a line that looks like this: <div class="dialog characterdialog ui-dialog-content ui-widget-content" data-characterid="-KleQDHK_lYqPjZB-hj_"...> which is where you get the character ID from. Hope that helps.