A new Helldivers 2 patch has been implemented into the game which nerfs heavy enemies, with an emphasis on Terminids like Chargers and Bile Titans. This includes spawn rates at difficulty seven and higher, as well as the chances of charger and bile titan spawn spikes - which had been resulting in multiple foes attacking all at once and overwhelming players.
The patch notes make clear that this isn't strictly a difficulty decrease, as these changes in enemy distribution will result in other enemy types coming in higher numbers. So while you may not see three chargers rushing you at once, expect to see other bugs and robots take their place.
It's also now easier to take down chargers in particular. In the patch notes, the devs make note of the community's efforts to tackle these enemies by focusing the backs of their legs with certain heavy weapons. This was a slightly tricky - if effective - way of taking them out quickly, but the team at Arrowhead have made adjustments, stating: "spending your heavy anti tank weapons on legs instead of the obvious weak point seems counter to expectation".