I have since 3 weeks ago started to use different presets for my subdecks. The mother deck however still has the standard preset and I tend to use the mother deck to review all the cards of my subdecks at once. I don’t know how this would affect the algorithm and which preset is used at all (the subdeck preset vs the standard one).
But this problem arises where whenever I try to optimize all my presets at once, I am getting huge never-seen-before log losses and RMSE drops. I am talking 11% loss (whereas I have only ever seen a 3% drop).