FIFA Ultimate Team is big business for Electronic Arts. Even while we sit and make fun of them for showing videos of people developing games instead of actual games at E3, they’re printing money, and FUT is the machine at work. Fans think they might’ve found a glitch, and if it’s true, it could  be huge.

Here’s how FIFA Ultimate Team works. This is a mode separate from the standard FIFA game in which players can buy cards that represent real athletes using real money. You can build your dream team with all your favorite players from all your favorite clubs. People who play this part of FIFA spend piles of money on it. Like, “bags with giant dollar signs on them” amounts.

You play these players together on the field the right way, and they’ll get a performance boost thanks to their chemistry. The better the chemistry, the bigger the boost. Better ball control, better movement.

In FUT, there are different versions of players. There’s the standard version, and the “in form” version, a player card that comes out when that player’s on fire in real life.

Some members of the community have been noticing that those special cards don’t seem to get the boost their numbers suggest ought to be the case. Lots of digging went into a huge Reddit post on the topic, and evidence assembled suggests the glitch might go all the way back to 2009.

EA has acknowledged the issue and says they’re investigating.

FIFA community manager Rob Hodson wrote the following post on the game’s official forums:

Thanks to the FUT community for raising awareness of a potential fitness and chemistry inconsistency in some FUT items. After hearing this, our teams were in over the weekend and continue to thoroughly investigate the information. We will keep you informed with updates from the investigation.

Our commitment to a fun, fair and secure experience in FIFA is ongoing, and as a community your feedback helps us achieve that goal. A special thanks for your continuous efforts across all channels.

There might not be a glitch here. Things might be working as intended. In either case, though, you have people spending tons of real money to get their ideal team, and the team isn’t operating the way the math seems to suggest. So either the math is wrong, or some of the math is hidden. Either way, players are likely to feel like they’ve been swindled unless EA handles this just right.