environmental SFX problem of road

[JIYIN]

Sorry to start a new topic for this, probably it's not a NAM's problem, but perhaps the experts here know better

I've just realized that after I dragged a normal road, there's the construction SFX could be heard, however, it persisted throughout the game becoming like the environmental SFX (e.g. the waves SFX at the seaside)

Anyone has such problem & has any solution for it? Thanks.