HQ% bug?

I have noticed this for the past few months and was wondering if anyone else had the same issue. I will use full +1 materials get the item to 80-100% HQ and when I finish the recipe it takes away a percentage. For example I was just crafting something and it was at 90% and then when I got the completion to 100% it took away 50% of my HQ down to 40% and made me attempt to double down at which point I failed and broke the item.

This is not a first time issue this has happened to me a lot. Does anyone have any insight into this?

That's Double Down. It means you didn't successfully HQ upon completion.

I was just curious because I have had this happen even with 100% chance of HQ it has dropped down to a lower % when I finished. Thanks for the reply

999 quality is 98%. Might have hit that.

Thanks, I appreciate the responses