Asterisk 13, AMI, Queue, NewChannel Local

Hi! I have Asterisk certified-13.13-cert4, Queue and 20+ operators.

In most case AMI events like Case 1 and Case 2, but sometimes like Case 3.

Case 1:
1 09:11:44,092 Newchannel SIP/AST-750-0013a24d
2 09:11:44,097 Newstate SIP/AST-750-0013a24d Ring
3 09:11:44,101 Newstate SIP/AST-750-0013a24d Up

4 09:11:58,301 Newchannel SIP/70107-0013a256
5 09:11:58,419 Newstate SIP/70107-0013a256 Ringing
6 09:12:01,727 Newstate SIP/70107-0013a256 Up
7 09:12:50,955 HangupRequest SIP/70107-0013a256
8 09:12:50,957 Hangup SIP/70107-0013a256
9 09:12:50,960 Hangup SIP/AST-750-0013a24d

Case 2:
1 09:37:54,864 Newchannel SIP/AST-750-0013a989
2 09:37:54,874 Newstate SIP/AST-750-0013a989 Ring
3 09:37:54,882 Newstate SIP/AST-750-0013a989 Up

4 09:38:09,116 Newchannel SIP/70107-0013a993
5 09:38:09,232 Newstate SIP/70107-0013a993 Ringing
6 09:38:09,238 Hangup SIP/70107-0013a993

7 09:38:09,241 Newchannel SIP/70202-0013a994
8 09:38:09,338 Newstate SIP/70202-0013a994 Ringing
9 09:38:14,069 Newstate SIP/70202-0013a994 Up
10 09:39:49,341 HangupRequest SIP/70202-0013a994
11 09:39:49,379 Hangup SIP/70202-0013a994
12 09:39:49,391 Hangup SIP/AST-750-0013a989

Case 3:
1 09:40:39,208 Newchannel SIP/AST-750-0013aa1c
2 09:40:39,213 Newstate SIP/AST-750-0013aa1c Ring
3 09:40:39,216 Newstate SIP/AST-750-0013aa1c Up

4 09:40:53,334 Newchannel SIP/70107-0013aa25
5 09:40:53,470 Newstate SIP/70107-0013aa25 Ringing
6 09:40:53,473 Newchannel Local/70107@from-operators-00002a78;1
7 09:40:53,475 Newchannel Local/70107@from-operators-00002a78;2
8 09:40:53,477 Newchannel SIP/70107-0013aa26
9 09:40:53,478 Hangup SIP/70107-0013aa25
10 09:40:53,611 Newstate SIP/70107-0013aa26 Ringing
11 09:40:53,612 Newstate Local/70107@from-operators-00002a78;1 Ringing
12 09:41:03,339 HangupRequest Local/70107@from-operators-00002a78;2
13 09:41:03,340 Hangup SIP/70107-0013aa26
14 09:41:03,342 Hangup Local/70107@from-operators-00002a78;2
15 09:41:03,343 Hangup Local/70107@from-operators-00002a78;1

16 09:41:08,347 Newchannel SIP/70109-0013aa2c
17 09:41:08,461 Newstate SIP/70109-0013aa2c Ringing
18 09:41:09,668 SIP/70109-0013aa2c Up
19 09:41:53,054 HangupRequest SIP/AST-750-0013aa1c
20 09:41:53,056 Hangup SIP/70109-0013aa2c
21 09:41:53,064 Hangup SIP/AST-750-0013aa1c

Why in Case 2 events 4-6, but the same thing in Case 3 events 4-15?
Below parts of queues.conf, extensions.conf, sip.conf and AMI log for cases.
https://pastebin.com/yRq1fjbJ