In the output for "show ip route summary" tehre is actually two counters you should look at:
r1#sh ip ro summ
IP routing table name is Default-IP-Routing-Table(0)
Route Source Networks Subnets Overhead Memory (bytes)
connected 1 0 64 152
static 1 1 128 304
bgp 1111 0 0 0 0
External: 0 Internal: 0 Local: 0
internal 1 1172
Total 3 1 192 1628
r1#
If you add a route with a classful mask, it will be added to the number of networks. If you add a route with a mask longer than the classful mask, it will be added to the number of subnets.
As long as your static entry show in the routing table and that you forward traffic to it, I would say your router works fine.
Hope this helps,
Regards,
Harold Ritter, CCIE #4168 (EI, SP)