/ip route print where "address_you_ping_here" in dst-address
on your bgp router.
May be your ISP, for some reasons, dont have prefixes you are looking for.
All prefix lengths are legit on Full View, but most ISPs drop longer then 24.
[admin@Core0] > ip route print where "46.38.56.76" in dst-address
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit