158.925 should be DPL 156.
154.935 should also be DPL 156. I've heard this one during Rock Hill events.
155.610 was previously associated with the PL tone of 127.3, but it was changed about August of 2000. Sometimes, an agency will adopt a new tone if there is an interference issue with the old tone.
Madison County, Fla (in the panhandle) uses 155.610 / 127.3 as the primary input for its sheriffs dispatch repeater, so any interference might have involved that agency.