Timeout while accessing cloudflare.com name servers

Hi.

I am representing small ISP form Poland (AS50153).
We recently found, that we cannot query cloudflare name servers:

Example:

$ dig -4 +trace mediaexpert.pl
(...)
mediaexpert.pl.         86400   IN      NS      cory.ns.cloudflare.com.
mediaexpert.pl.         86400   IN      NS      abby.ns.cloudflare.com.
(...)
;; Received 853 bytes from 185.159.197.48#53(d-dns.pl) in 28 ms

;; communications error to 172.64.32.100#53: timed out
;; communications error to 108.162.193.93#53: timed out
;; communications error to 172.64.33.93#53: timed out
;; communications error to 173.245.59.93#53: timed out
;; communications error to 108.162.192.100#53: timed out
;; communications error to 173.245.58.100#53: timed out

$ ping  172.64.32.100
PING 172.64.32.100 (172.64.32.100) 56(84) bytes of data.
64 bytes from 172.64.32.100: icmp_seq=1 ttl=57 time=5.08 ms

Same problem happens where we are trying to access the 1.1.1.1 server:

$ dig cloudflare.com @1.1.1.1
;; communications error to 1.1.1.1#53: timed out

Everything works from non-our IPs. So it looks that we are blocked…
How we can resolve this issue?

Regards,
Piotr.

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