[xG table on European Group Stages bug]

It's taking the xG from club performances in their respective leagues: clubs that don't have their nations loaded will naturally have played no matches, and hence no xG data. Regardless, that's clearly not what's meant to be happening!

 

[English Premier Division Data discussion]

Just a few minor things I noted with Villa's backroom staff setup:

Jeremy Oliver is listed as a scout: he is Villa's performance director, which is probably the closest thing Villa have to a technical director. His contract is also much more fitting of a technical director, considering he gets paid £10k per week! (Source: https://www.birminghammail.co.uk/sport/football/football-news/aston-villa-steven-gerrard-staff-22190918)

On the other hand, Frederik Leth is listed as Villa's technical director. His role at Villa is 'Head of Football Research': or head of data analytics. This probably fits Performance/Recruitment Analyst a lot better than Technical Director (Source: https://trainingground.guru/articles/villa-head-to-copenhagen-again-for-new-head-of-research)

Nick Haycock is down as a scout for Villa, but he is "Head of Technical and Player Development". Judging from the job description in the source (leading coaching throughout Villa's academy setup), the closest role in the game to his job would be as U21 coach. If the case, £10k p/w might be a little high! (Source: https://trainingground.guru/articles/haycock-leaves-premier-league-to-join-aston-villa)