PGP key checking

I just signed and checked some pgp keys (using pgp 2.6.1) and I found something unexpected: Keys can be checked with the -kc option. To identify the key to be checked either a string or the KeyID (with 0x-prefix) can be given as an argument. If I do now pgp -kc name_of_anyone pgp -kc 0xanyones_key_id for the very same key (once identified by substring, once by keyid, which should both do the same job) the first command checks many more signatures than the second command. The second command stops earlier, but I couldn't find out yet, whether this stops after finding a trusted path to the checked key or what else could be the reason for this. Any ideas? Hadmut