Dimmer rule with while loop?

i dont have another rule running on this hue bulb in OH. at the hue hub i dont have any rules (its all in OH) or special settings. if i change the light manually, it doesnt change back to 100.
i even tried it out after the restart of OH, but its still the same.

What happens if you change the bulb by the item Hue_wohnzimmer_StehlampeSofa_Farbe with a slider is the UI? or HABpanel?

then everything is fine if i didnt fire the rule. when the rule is fired, the value goes back to 100:

==> /var/log/openhab2/openhab.log <==

2018-09-11 19:00:02.801 [INFO ] [lipse.smarthome.model.script.TESTING] - Dimming the light

2018-09-11 19:00:02.802 [INFO ] [lipse.smarthome.model.script.TESTING] - 100

==> /var/log/openhab2/events.log <==

2018-09-11 19:00:02.808 [ome.event.ItemCommandEvent] - Item 'Hue_wohnzimmer_StehlampeSofa_Farbe' received command 90

2018-09-11 19:00:02.813 [vent.ItemStateChangedEvent] - Hue_wohnzimmer_StehlampeSofa_Farbe changed from 23,83,100 to 23,83,90

2018-09-11 19:00:04.004 [ome.event.ItemCommandEvent] - Item 'Hue_wohnzimmer_StehlampeSofa_Farbe' received command 48

2018-09-11 19:00:04.007 [vent.ItemStateChangedEvent] - Hue_wohnzimmer_StehlampeSofa_Farbe changed from 23,83,90 to 23,83,48

2018-09-11 19:00:05.374 [vent.ItemStateChangedEvent] - ZWaveSerialController_StartFrames changed from 8938 to 8939

2018-09-11 19:00:05.377 [vent.ItemStateChangedEvent] - Zw_steckdose_wohnzimmer_media_ElectricMeterVolts changed from 224.258 to 226.138

2018-09-11 19:00:05.465 [vent.ItemStateChangedEvent] - ZWaveSerialController_StartFrames changed from 8939 to 8940

2018-09-11 19:00:05.564 [vent.ItemStateChangedEvent] - ZWaveSerialController_StartFrames changed from 8940 to 8941

==> /var/log/openhab2/openhab.log <==

2018-09-11 19:00:08.812 [INFO ] [lipse.smarthome.model.script.TESTING] - Dimming the light

2018-09-11 19:00:08.813 [INFO ] [lipse.smarthome.model.script.TESTING] - 48

==> /var/log/openhab2/events.log <==

2018-09-11 19:00:08.819 [ome.event.ItemCommandEvent] - Item 'Hue_wohnzimmer_StehlampeSofa_Farbe' received command 38

2018-09-11 19:00:08.822 [vent.ItemStateChangedEvent] - Hue_wohnzimmer_StehlampeSofa_Farbe changed from 23,83,48 to 23,83,38

2018-09-11 19:00:11.224 [vent.ItemStateChangedEvent] - Hue_wohnzimmer_StehlampeSofa_Farbe changed from 23,83,38 to 23,83,100

==> /var/log/openhab2/openhab.log <==

2018-09-11 19:00:14.820 [INFO ] [lipse.smarthome.model.script.TESTING] - Dimming the light

2018-09-11 19:00:14.824 [INFO ] [lipse.smarthome.model.script.TESTING] - 100

Very strange indeed…