> Does it indicate that they're more tricky than others and hence more bug reports?
They're all static languages. In fact, so are C# and Java (the next two of the top 5).
Two of these (C++ and Rust) are also in the top 5 for pushes per repo. C++ being top overall.
Imho, some of these stats needs to be scaled with respect to LOC. The push/issue ratio might be good as well.