Variable Coefficients in Coefficient form PDE

Hello,

I am working to solve the following two equations in the attached images in COMSOL for a non-dimensionalized reaction diffusion problem. I am using the coefficient form PDE module in COMSOL 5.3. For some reason, the result I obtain is vastly different depending on if I define the term to be inside d_a (the damping coefficient), or if i divide the whole equation by and define c (the diffusion coefficient) and f (the source term) appropriately. These two cases should be entirely equivalent, but they are significantly different. Why? Which is correct?

Thank you!