I've had a bunch of these "duplicate" timers too, for me it appears to have started with timers dated a week ago.
One of the "duplicate" timer pairings has the exact same Ice Timer ID value, implying the delete of the original timer failed to occur.
The remainder have an Ice Timer ID value for one of the "duplicate" pairing whilst the other does not, even though they both came from IceTV.
Some of the pairings have the exact same start/end times.
RecordTimerEntry(name=MasterChef Australia, begin=Wed May 29 19:20:00 2019, end=Wed May 29 21:10:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=MasterChef Australia, begin=Wed May 29 19:20:00 2019, end=Wed May 29 21:10:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460931876180420)
RecordTimerEntry(name=The Bay, begin=Wed May 29 21:50:00 2019, end=Wed May 29 23:25:00 2019, serviceref=1:0:19:564:506:1013:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460931993620935)
RecordTimerEntry(name=The Bay, begin=Wed May 29 21:50:00 2019, end=Wed May 29 23:25:00 2019, serviceref=1:0:19:564:506:1013:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=The Good Fight, begin=Wed May 29 21:25:00 2019, end=Wed May 29 22:55:00 2019, serviceref=1:0:19:325:320:3202:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=The Good Fight, begin=Wed May 29 21:25:00 2019, end=Wed May 29 22:55:00 2019, serviceref=1:0:19:325:320:3202:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460931993620934)
RecordTimerEntry(name=Blindspot, begin=Wed May 29 23:20:00 2019, end=Thu May 30 00:55:00 2019, serviceref=1:0:19:564:506:1013:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460934963188169)
RecordTimerEntry(name=Blindspot, begin=Wed May 29 23:20:00 2019, end=Thu May 30 00:55:00 2019, serviceref=1:0:19:564:506:1013:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=Hawaii Five-0, begin=Wed May 29 23:00:00 2019, end=Thu May 30 00:30:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460934963188168)
RecordTimerEntry(name=Hawaii Five-0, begin=Wed May 29 23:00:00 2019, end=Thu May 30 00:30:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=MasterChef Australia, begin=Thu May 30 19:20:00 2019, end=Thu May 30 21:10:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460934963188170)
RecordTimerEntry(name=MasterChef Australia, begin=Thu May 30 19:20:00 2019, end=Thu May 30 21:05:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=Blue Bloods, begin=Thu May 30 22:25:00 2019, end=Thu May 30 23:55:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=Blue Bloods, begin=Thu May 30 22:30:00 2019, end=Thu May 30 23:55:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460934996742608)
RecordTimerEntry(name=Chimerica, begin=Thu May 30 21:20:00 2019, end=Thu May 30 22:55:00 2019, serviceref=1:0:19:325:320:3202:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=Chimerica, begin=Thu May 30 21:20:00 2019, end=Thu May 30 22:55:00 2019, serviceref=1:0:19:325:320:3202:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460934979965388)
RecordTimerEntry(name=The Voice Australia, begin=Sun Jun 2 18:50:00 2019, end=Sun Jun 2 21:00:00 2019, serviceref=1:0:19:462:460:1012:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460935248400865)
RecordTimerEntry(name=The Voice Australia, begin=Sun Jun 2 18:50:00 2019, end=Sun Jun 2 20:55:00 2019, serviceref=1:0:19:462:460:1012:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=MasterChef Australia, begin=Mon Jun 3 19:20:00 2019, end=Mon Jun 3 21:10:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460935483281906)
RecordTimerEntry(name=MasterChef Australia, begin=Mon Jun 3 19:20:00 2019, end=Mon Jun 3 21:05:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0)
RecordTimerEntry(name=MasterChef Australia, begin=Tue Jun 4 19:20:00 2019, end=Tue Jun 4 21:10:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460935483281910)
RecordTimerEntry(name=MasterChef Australia, begin=Tue Jun 4 19:20:00 2019, end=Tue Jun 4 21:05:00 2019, serviceref=1:0:19:684:607:1014:EEEE0000:0:0:0:, justplay=0, isAutoTimer=0, ice_timer_id=16503460935483281910)
Cheers,
Geoff