https://streamable.com/dyb1ra https://streamable.com/urypvz
^ Clips of the issue

Modpack ATM 10 Version 2.6

Sometimes when killing mobs and the deep learner is in the curio slot, the kill counter can go up by any number, sometimes 1-5, 5-15, or even 50+ resetting your counter completely.

i get the same issue, but i've noticed that it doesn't seem to happen when i have the learner in my offhand. it only occurs when it's in the curio slot.

Playing ATM10 version 2.1. Having same issue, but also happens when i open the deep learner to remove the model (or possibly when i remove the deep learner from my curios slot). I will have to do more testing to work out which. But yes, often (always?) 1 kill out from updating phantoms or skulkers or something to next tier, only for current tier to be reset. Will need to do more testing to confirm is always 1 out. Not sure yet.

Not sure what would be causing this. It doesn't appear to happen in isolation with Curios API Continuation (the one I develop against). Possible this is a mod interaction issue with something in ATM10 or an issue with Adorned (the fork of curios that ATM uses).

Was this on a dedicated server or in singleplayer?

For me in single player.

I am almost certain this is a curios issue to some degree. It does not happen with Curios API Continuation, but does happen with Adorned and also happens with mainline Curios.

A few people think this may be related to FTBTeam/FTB-Modpack-Issues#6642, which is a "reopening" of FTBTeam/FTB-Modpack-Issues#6183, a similar bug that the reporter closed without a resolution. Since it seems easy to replicate with the ender dragon model, in single player, you might want to take a look.

I included 3 log files: debug, latest, and console. No entries jumped out at me.

I am almost certain this is a curios issue to some degree. It does not happen with Curios API Continuation, but does happen with Adorned and also happens with mainline Curios.

Since curios compilation has been "frozen" and the Adorned dev is no longer providing updates (JDKDigital/Adorned#16 (comment)), I believe the official Curios continuation is the recommended one. I would expect it to be used by most players going forward. (FTB Evolution 1.9.0 just transitioned.)

Its devs are claiming this (class of?) bug is entirely your problem (TheIllusiveC4/Curios#471). Have you considered getting in touch with them and hashing it out?