Plugins loading multiple times

By inserting an error_log('GOT HERE') command in more than one of my plugins I am finding the main plugin files are being somehow loaded multiple times. In some cases 3 or 4 times. Even well known plugins like gravityforms. Is this normal? If not, any thoughts on how I may troubleshoot how this is happening. Seems a heavy use of valuable load time.

What sayeth the group?

Jay
CompuMatter

p.s. this may not be the best place to post this but I have not found the proper place.