They are not swapped and we are a different language to Zig, and there is no standard naming convention for the differences between modulo and remainders, even in mathematics. However % in Odin is akin to how it works in C and have kept the general naming conventions of C.
So there is no “mixed” naming convention, per se, but rather there is no real convention of what is meant by remainder or modulo, as much as people would like it to be.