There is an intermittent glitch when adding cards to tradelist where the quantity reverts back to the original number, and then the system adds a line item to the card with 0 in inventory and 0 in tradelist. When you click the quantity that opens up the small window to manual adjust quantities, you can see the 0/0 line item, and then when you change the correct line item to what you want it show, and then save, the 0/0 line item disappears. This problem is intermittent with no discernable pattern. It happens pretty randomly, but once it starts, it usual does not resolve for a while, even after closing the browser and trying again. Is this a known bug?

EDIT: This appears to only happen when adding 1 card to tradelist when there is 1 card in inventory. When adding 1 card to tradelist when there are 2 or more cards in inventory, the problem does not appear to happen, and it resolves the bug for several adjustments, but eventually the bug happens again when adding 1 to tradelist with 1 in inventory.

2nd EDIT: I can confirm that the bug only occurs when the card is marked as English.

3rd EDIT: Confirmed that it's not limited to just qty 1

Fixed now, thanks for reporting. It happened when the + "wanted" to add something to the tradelist, but there was no available inventory count for it. I changed it now so that it adds 1 to the inventory too in that case. I'm a bit hesitant to change the semantics here, I thought it might now be confusing, but I assume that's what most users would like to happen: if you have inventory count available and you click on +tradelist you just want to mark one as tradeable. But if you don't have enough and you click on + you want one added to the trade + inv to "fix the problem"?

Let me know what you think.

Actually, this makes the problem worse. With this change, when adding quantity one to trade list when there is already one inventory creates a new line item and add another one to inventory. What the issue was, was when adding one to trade list when there was one (or more) in inventory, if the card was marked as English, it would add a line item of 0 inventory and 0 trade list, which you would then have to go in manually and remove the new line item of 0/0 and then change the trade list to qty 1. I appreciate the effort that went into to the attempted fix, but with the change, it is not possible to add one from inventory to tradelist without simultaneously adding one to inventory.

So you have some background on why I wanted a fix; I was trying to add all cards in inventory from specific sets to my tradelist, but I kept having the intermittent problem where the addition to trade list would not work, and the result of that attempt would create a new line time of 0 inventory and 0 tradelist if the card was marked as English.

The problem is the defaults. if you have 1 in inventory with the exact same details as what your defaults are set to, then clicking on the +1 for tradelist just adds 1 to tradelist. But if for example you have "Language: english" as defaults for inventory/tradelist, and you have 1 card in your inventory that is "language: none" or "language: german", then clicking the +1 to tradelist will not use that german one, it will look at what your defaults are, and try to add one with those.

I will think about this some more. Perhaps you are right and now it's confusing and worse than before. It's difficult to know what to do for this +1. Ambiguous cases like for example if you have 2 separate inventory entries, with different details are also bad. This is why initially i thought the +1 should try to add 1 with the details set to whatever the defaults are for condition/language/flags.