They are both feebas and one is from another ot. Shouldn't that make the chance higher? I have no idea what's going on, please help.
If the DayCare Man actually says "The two prefer to play with other Pokémon rather than eachother.", then the problem is (most likely) that, it is a common mistake that people make.
If there's a Male and a Female in the DayCare, then it's probably just a glitch. Maybe get a Ditto and try breeding with that in stead?
Source. (It also says about how chances increase and such)