Why MATLAB on Mac reads functions as scripts instead of functions?

Whenever I attempt to call on a function in my script I get an error stating "Execution of script rd_segy as a function is not supported" but this function is saved as a function and not a script in MATLAB. This keeps randomly happening, and yes I am certain that the function is actually a function and not a script. How do I fix this issue? All of the codes I'm using were created using my mac. I also am able to run the scripts without receiving this error when I use my windows pc.

[Stephen23]

@Brianna Miranda: please upload one of these strange script/functions by clicking the paperclip button.

[Torsten]

@Brianna Miranda

And it works under Windows ?

[Bruno Luong]

If you type

which rd_segy  

when the error occurs what do you get?