bgp network only can advertise 5 list network

hi all,

i have configuration like this:

routing bgp network> pr
Flags: X - disabled

NETWORK

0 202.180.55.0/24
1 202.180.54.0/24
2 202.180.53.0/24
3 202.180.48.0/24
4 203.191.43.0/24
5 202.180.49.0/24

4 chain=bgp-out prefix=203.191.43.0/24 prefix-length=24 invert-match=no
action=accept

5 chain=bgp-out prefix=202.180.55.0/24 prefix-length=24 invert-match=no
action=accept

6 chain=bgp-out prefix=202.180.54.0/24 prefix-length=24 invert-match=no
action=accept

7 chain=bgp-out prefix=202.180.53.0/24 prefix-length=24 invert-match=no
action=accept

8 chain=bgp-out prefix=202.180.48.0/24 prefix-length=24 invert-match=no
action=accept

9 chain=bgp-out prefix=202.180.49.0/24 prefix-length=24 invert-match=no
action=accept

10 chain=bgp-out invert-match=no action=discard


then i look at :

routing bgp advertisements> pr
DST-ADDRESS NEXTHOP PEER AS-PATH ORIGIN LOCAL-PREF
202.180.55.0/24 202.53.225.174 peer1... igp
202.180.54.0/24 202.53.225.174 peer1... igp
202.180.53.0/24 202.53.225.174 peer1... igp
202.180.48.0/24 202.53.225.174 peer1... igp
202.180.49.0/24 202.53.225.174 peer1... igp

why network 203.191.43.0/24 can't advertise to my peer. the i change my configuration like this :

Flags: X - disabled

NETWORK

0 202.180.54.0/23
1 202.180.53.0/24
2 202.180.48.0/23
3 203.191.43.0/24

routing bgp advertisements> pr
DST-ADDRESS NEXTHOP PEER AS-PATH ORIGIN LOCAL-PREF
202.180.54.0/23 202.53.225.174 peer1... igp
202.180.53.0/24 202.53.225.174 peer1... igp
202.180.48.0/23 202.53.225.174 peer1... igp
203.191.43.0/24 202.53.225.174 peer1... igp

the 203.191.43.0/24 being advertised to my peer now, it's seem mikrotik only can advertise 5 list network. is there any can verify this?any suggest......
also i have problem when advertise new blok ip to peer, the peer router and my mikrotik must be
clear bgp or reset bgp peer before it can work.