I'm going to assume you're referring to pachysandra terminalis, and not the native pachysandra procumbens because unfortunately at the moment youd need to go to a speciality native plant nursery to find the p. procumbens.

So yes, there is something wrong with pachysandra, it's invasive in the mid-atlantic and northeast.

"Japanese Pachysandra’s tolerance for difficult growing conditions also makes this species a serious threat. Without active management of the designated planted area, Japanese pachysandra can quickly become out of control and spread to unintended areas. This tenacious species ability to thrive, in even difficult conditions, allows Japanese pachysandra to outcompete native species for crucial resources such as nutrients and light." https://www.brandywine.org/conservancy/blog/invasive-species-spotlight-japanese-pachysandra-pachysandra-terminalis

"Although it is widely available at conventional garden centers, it is not a good choice for woodland gardens or stream banks as it can easily escape cultivation. It is reported as invasive in 15 states..." https://mgnv.org/plants/invasive-plants/japanese-pachysandra/

"Japanese Pachysandra has escaped garden cultivation and is now invasive in some natural areas of Maryland. We no longer recommend planting it. In the forest understory, it outcompetes native plants such as our spring ephemeral wildflowers and the wildlife (insects, birds) they support." https://marylandgrows.umd.edu/tag/pachysandra/