I have this happening on a bunch of different character sheets in two different games, and across two different computers (although they're both running Firefox so that might be related) In the Dark Heresy 2nd edition character sheet, below Ranged Weapons, there is a section for Gear. Each line under Gear is actually 3 lines - a long one for the item, and two short ones that could be used for item weights or tallies for magazines of ammunition When using the first line for an entry like "Boltgun w/4 spare magazines", I put "4+1" in the last slot to show how many magazines are available. When I close that character sheet and leave the campaign, the 4+1 disappears from that cell. As far as I can tell, this only applies to the first line, because I have another standard-issue gun on the next line with 2+1 in the last slot and it stays just fine, as do the grenades in further lines down from that, so it doesn't seem that the syntax in that cell is the issue either. It's not game-breaking, it's not even all that important because I can always just move the armour to that line and put the guns and ammo another line down, but it is a tiny bug. EDIT: After creating a blank campaign and experimenting a bit to see if this is triggered by syntax or by duplicating a character sheet or duplicating a campaign or any of the other things that I had done with the original source, I think I have it narrowed down. Rarely, after entering the magazines as 4+1 in the last cell, it gives a tooltip saying "Please enter a number" which implies that a single cell on that list is formatted as numerical value only while all the rest are formatted as text. Because the input isn't valid, it drops the value when the sheet saves and the character sheet is closed. Simply listing the value as a single number doesn't trigger the issue, so I can always change how I'm notating available magazines. It's a generic field anyway, so this is the smallest of small and irrelevant bugs that can easily be worked around, but I'm proud of myself for narrowing down what the cause seems to be.