Try compiling them locally... something is wrong with the online compiler (aka Get Plugin link). The compiled file sizes should not be 1mb in size.
SH core file compiled is not even that large... If you ever have an .amxx that is that large more than likely it is bad, so I would check the size of the file every time if you plan on using the Get Plugin link.
You may have better luck with the actual web compiler:
http://www.amxmodx.org/webcompiler.cgi
I think for some reason files that are supposed to error out with "Get Plugin" are actually compiling with error information inside them and making 1mb+ files....