Repeaters don't render the correct delay length while powered, but does render correctly unpowered.
When placing a repeater, it gets placed towards you. (MC-56921)
Powered repeaters only show 1-tick model
Repeaters show with 1 tick when powered
Repeaters change texture when powered
Redstone repeater graphical bug.
Redstone and Item Frame Issues
Redstone Repeater Glitching
Redstone repeaters change tick setting view when turned on
14w25a Repeater Issue
Repeater delay issue