Non CISCO unknown devices are being discovered in LMS

Hi!
I have had no problem with discovery which was used on cdp basis so far.
Now the CDP packets do not arrive via new MPLS backbone network. I have to use the "ping sweep feature in IP range" feature. I had to enter more than 400 subnet from file before there are more than 400 branches. ( etc. 10.31-9.1-50.252 255.255.255.252 )
I have experienced two problems
1. The discovery never end ( now this is not important ) :-)
2. The common services -- device management shows discovered unknown devices whose ip addresses out side the range what are entered by me in the ping sweep range and theirs OID is not CISCO.
( 1.3.6.1.4.1.2001.1.1.1.1 , 1.3.6.1.4.1.11.2.3.9.1 , 1.3.6.1.4.1.674.10892.2 , 1.3.6.1.4.1.18334.1.1.1.2.1.7.1.2 and even more )
Due to more than 300 unknown devices the LMS device number is beyond the license number!!!!!
Our questions.
Why does lms add the unknown devices ( non cisco devices ) to the inventory ?
How could lms discover these devices ??? ) ( theirs IP are out of ping sweep range and non cdp capable devices )
Thanks in advance!

Thank you!
The unknown devices were in unreachable state and they were added to DCR.
I don't use include or exclude filter what were referred by bug.
In spite of i use seed device list from file the LMS ping sweep debug log shows that LMS try to ping other IP addresses!!!!
You're right, it is not normally operation may be TAC will be needed to solve it.
( whether who tested it ?)
Regards,

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