I'm not sure if I'm missing something, but in my guild auto tracking joins ald leaves from the raid doesn't work. I have to add attendances manually. Could you check it or give me some tips what I'm doing wrong?

Roster on boss kills is working properly, but it doesn't count to overall attendance

Well, that's odd.
If boss kills works properly, so will the attendance tracking functions.
Check if the button on the top left shows "TRACKING...".
And also check if there's any lua error.

Here is screenshot from yesterday raid. Attendec section is emty, but boss kills was recorded correctly.
Track button was enabled. I don't know if there was any errors. I have few errors in Buggrabber, but there is only "3x (null)". No more details.

Hmm...
Try to stop then start tracking by clicking on TRACK button.
Actually, I've no idea about what's going wrong. >_<
Or you can try my version of GRA.
GuildRaidAttendance.zip

I think I know what is going on. My realm name is "Burning Legion". In config lua file in roster section my nick for example is writter as "Gullyy-BurningLegion" but in function here https://github.com/enderneko/GuildRaidAttendance/blob/master/Track.lua#L25 is checking for "Gullyy-Burning Legion" which is false. Please not this extra space in realm name.

Toggling Track button doesn't help. Your version also doesn't work.

Awesome!