C and C++ don't leave a footprint like Nim does. Nim is higher level so its low level output will have some repetitive patterns.
On that note other compiled high level languages might not encounter this problem as much since they tend to use things like LLVM which either optimize away those patterns or are too common that antiviruses don't complain. I haven't seen anyone report an antivirus issue with a Nim binary that wasn't built on GCC.