Suspicious Multi-Crit and then next couple rounds a Quintuple Crit During a 5e game. Maybe just a bug in Monk Char sheet?

This week we had a big roll 20 update and I wonder with all the changes if I missed something. I had a player spit the party and find himself against some rather benign Giant Lizards (He did not know this). He is very much a meta-gamer and really hates to loose. What happened next left me flabbergasted, but it was late, another player had to go in 20 minutes and the lizards were pretty benign so I went ahead an rolled with it anyways. When I finally thought to look at his char sheet everything looked perfectly normal. Yesterday at encounters when I mentioned to one of the players who is in both games, "wow did you see all those crits by Grigor" he replied that he thought Grigor "Hammed it up". So now I'm trying to figure out if that is true, or if the Monk character sheet is broken. It's high up in the chat log so I had to go on the "entire log" but I found this: At this point I was not so concerned. Next round he misses with a Q-staff and then madness! Mind you all 4 attacks of Grigor are those made in a row by his character (though other characters are in between the first and second set of attacks). Here is what the Grigor's hit looks like when I hover over it compared to two other guys who rolled. Malxire actually rolled right before Grigor and Aelar right after. Malxire is a Wizard, Aelar a Ranger. This is really suspicious to me because the equation is so different. He's just a monk using unarmed strike. When I hover over the chat log he has the same long equation for the first screenshot. Here is the damage roll compared to a damage crit roll of another player (Zakn, Rogue) who has normal equations like Malxire and Aelar: Help is appreciated guys. I can't tell how Grigor could be goofing the macro when you get the green tag that says "Unarmed Strike/Grigor · Melee Attack", so it feels like the Monk sheet broke with the latest update.

The formula used when a weapon is set to finesse is significantly different than when it is not set to finesse. It has nothing to do with the character itself (or the class). This is necessary because with Finesse proper you need to determine whether or not to use DEX or STR which is what makes the output significantly different. Based on the output, looks like he basically got lucky is all...

Thank you so much Kevin! I tested this on another campaign and the formulas came out crazy but appeared to match. I didn't realize finesse was so much different. I'm glad because He's a good kid and great to have around when I need rules. He's overcome a lot of his shyness at general social things over the past few months I've known him. I was afraid because I have to keep the balance for other players and just don't know much about the coding yet. Looks like an epic fight for Grigor! I certainly described it as such ;)

There is nothing broken here and as Kevin mentioned the extra math is to work out which stat mod to use depending on which is higher for finesse. What is important though, is that the extra math makes no difference to whether a roll is a crit (and gets the green highlight) or not. Only the first dice roll impacts whether the roll is a crit, not the full total. For the attack rolls you can see in the tooltip that the roll is a 20 so it is a crit (and the crit range field is set to 20 for that weapon too....hence the 1d20cs>20 part). The damage rolls were 1d4 and you can see that resulted in a 4 before all the math. In both cases, the actual rll result is highlighted in green when you crit (or red when you crit fail) too so it should be easy to spot. All you need to look at for checking crits is the dice roll part. if you need to break down the math though I can see that the monk has a Strength score of 10, a Dex score of 18, is level 2 (and has multiclassed) and therefore has a proficiency bonus of 2. So with a 20 on the dice, +4 from the dex mod, and +2 from proficiecy we get to 26 :)