Timer alarm sent every time the phone goes in standby

I installed Openhab App on my Samsung A50 and each time the display turn off (the app send to the server a new alarm setting. No Tasker or other apps of this kind installed.
Each time I open Samsung Clock app the Openhab app send the correct alarm, but each time display goes off incorrect alarm are sent.
What can I do to understand what app set wrong alarms?

2019-12-26 15:22:45.556 [ome.event.ItemCommandEvent] - Item 'SvegliaLorenzo' received command 1577370249475
2019-12-26 15:22:45.567 [vent.ItemStateChangedEvent] - SvegliaLorenzo changed from 1577426101000 to 1577370249475
2019-12-26 15:23:04.004 [ome.event.ItemCommandEvent] - Item 'SvegliaLorenzo' received command 1577426101000
2019-12-26 15:23:04.015 [vent.ItemStateChangedEvent] - SvegliaLorenzo changed from 1577370249475 to 1577426101000

==> /var/log/openhab2/openhab.log <==
2019-12-26 15:23:04.054 [INFO ] [eclipse.smarthome.model.script.alarm] - Scheduling alarm for 2019-12-27T07:00:01.000+01:00

==> /var/log/openhab2/events.log <==
2019-12-26 15:23:34.958 [ome.event.ItemCommandEvent] - Item 'SvegliaLorenzo' received command 1577370249474
2019-12-26 15:23:34.975 [vent.ItemStateChangedEvent] - SvegliaLorenzo changed from 1577426101000 to 1577370249474
2019-12-26 15:24:09.018 [ome.event.ItemCommandEvent] - Item 'SvegliaLorenzo' received command 1577426101000
2019-12-26 15:24:09.030 [vent.ItemStateChangedEvent] - SvegliaLorenzo changed from 1577370249474 to 1577426101000

==> /var/log/openhab2/openhab.log <==
2019-12-26 15:24:09.070 [INFO ] [eclipse.smarthome.model.script.alarm] - Scheduling alarm for 2019-12-27T07:00:01.000+01:00

==> /var/log/openhab2/events.log <==
2019-12-26 15:24:57.794 [ome.event.ItemCommandEvent] - Item 'SvegliaLorenzo' received command 1577370310385
2019-12-26 15:24:57.818 [vent.ItemStateChangedEvent] - SvegliaLorenzo changed from 1577426101000 to 1577370310385
2019-12-26 15:25:26.070 [ome.event.ItemCommandEvent] - Item 'SvegliaLorenzo' received command 1577370338443
2019-12-26 15:25:26.080 [vent.ItemStateChangedEvent] - SvegliaLorenzo changed from 1577370310385 to 1577370338443
2019-12-26 15:25:39.173 [ome.event.ItemCommandEvent] - Item 'SvegliaLorenzo' received command 1577370518494
2019-12-26 15:25:39.186 [vent.ItemStateChangedEvent] - SvegliaLorenzo changed from 1577370338443 to 1577370518494
2019-12-26 15:26:26.244 [ome.event.ItemCommandEvent] - Item 'SvegliaLorenzo' received command 1577426101000
2019-12-26 15:26:26.265 [vent.ItemStateChangedEvent] - SvegliaLorenzo changed from 1577370518494 to 1577426101000

==> /var/log/openhab2/openhab.log <==
2019-12-26 15:26:26.310 [INFO ] [eclipse.smarthome.model.script.alarm] - Scheduling alarm for 2019-12-27T07:00:01.000+01:00

Hey @Lorenzo,
the Android app allows you to view its log in the settings. In the log there should be some lines Alarm sent by com.example.app. Can you post these lines here?