Constant swarms of zombies wandering the same places

What is causing this, there is nothing underground making noise, nothing above ground nearby… They are constantly forming large groups and heading in the direction of a radio tower, which happens to be taking them right by where I set up, and it’s getting annoying.

if you mean swarms from the dynamic spawns, iirc, every 20 “units” of sound spawn zombies, so you can walk a bit and boom, zombies, if not, the only thing i can think of is the PC smell

It’s possible I may have made that much sound myself, I’ll have to pay closer attention, didn’t think it required so little to create horde spawns. Thanks for the input! Will see if that is the cause