Era quest glitch?

Yes, most everyone is experiencing this

I'm not excusing CG. If it's supposed to be 200 they should say that, and if it's not, they should have gotten the programming correct. 

But that said, this is a year-long feat and Purge is as easy to rack up as DoTs if you have the right team. 

If you don't have the right team, you'll have to use some Inqs in Conqest and plink away at it until you can get Grand Inquisitor and/or Reva. I'll admit that's not fun, but with a whole year to get it done, no one is going to miss out on this feat bc of the 200 purge requirement (whether it was a bug or a bad description). 

OP has 2 threads open with the same question, apparently this thread didn’t go through until later

https://forums.ea.com/discussions/swgoh-general-discussion-en/why-do-i-have-to-do-more-work/13105557

Or just play out the R2 Journey Guide.