I have an "incompréhensible"

on my server, I have HMon 7.52 installed, oracle client 10.0.2. and TOAD for oracle( is an industry-leading, proven database development and administration tool) Toad is working too with the same tnsnames.ora installed in directory \oracle\product\10.2.0\client_2\NETWORK\ADMIN
I have 26 oracles DB defined in tnsnames, but when I add an DB oracle test, I see only 15 names available in tnsnames counting 26 DB

When I'm using TOAD and I want to connect to one DB, I can see all the 26 db availables.

I will precise that is not the first file. I've modified it to add and delete some DB specifications, but when I use Hmon again, there is no change in it!!!!!!
Did Hmon generate something with tnsnames.ora ?
If anyone has an idea ...... I will appreciate.
Thanks.
Gilali