Bugged combat encounter. Again

Franz is at it again. Asks for roll, there is no button. I prompt him to display the button. He provides one, but the formula is wrong (doesn’t apply Rogue Dex modifier). I feed him the correct formula. After a couple of tries, he manages to display the button and related info correctly. I roll. Once again, he forgets about Sneak Attack. I prompt him, I get my roll. But the actual encounter is not created, I don’t have any details about what I’m facing or its HP. I ask him if the creature is dead. It’s not, but he informs me that “It is lying on the floor, twitching and severely wounded, but it is still breathing. It looks dazed and unable to move quickly, but it remains a threat if left alone.“ So I get to attack it again. This time it’s dead. I have to roll for Investigation in order to find out what it was. A Resonance Stalker (he made it up for this campaign, can’t find any stats for it in Odrun Fell compendium). He forgot to award me XP for the kill, I have to prompt him. He awards me 150 XP and displays a character XP progression bar which is about half of what’s on my character sheet. I don’t even bother to ask about it. This will probably be the second campaign I delete due to shitty combat encounters