I was training a prerequisite extension to unlock another one with server side lag. I clicked the upgrading button and the popup came up asking if I wanted to train it to 5. After accepting, nothing happened so I tried it two more times. There was no pop-up box asking if I wanted to do it or anything, just nothing happening the last two times.

I relogged, hoping to fix the lag, and after coming back I noticed I had spent all my free EP on skill I didn't need and it was now at 7.

I only lost a week or so worth of EP, but the potential is there to seriously mess someones plan up.
Is there a way to make it work with occasional server lag?