I am not seeing that in either of my "live" nodes in the office. Just about a dozen regular peers. Both are running 0.21.1
I have a 0.20.0 at home that I just turned on for the 1st time in a few weeks to see and it seems to syncing be fine with about 5 peers none blocked so far (15 minutes since boot +/- a few)
Are they all coming from 1 IP block or from everywhere?

-Dave