Different brokers, different results, same EA

Ron N.
23
Ron N.  
Hey, this is basically a general question but it's related to EAs. I find that my EA does not work the same way with one broker, Prosperity, versus another, Hugosway. I did program the EA using a Hugosway client in MQL4. Is this a coding issue or are there actual differences between brokers? Thank you for the help!
Ron N.
23
Ron N.  
Possible bump? Basically, what I'm asking is are there any differences in terms of coding between different brokers but it's all under the same MQL4 language?