Why can't I rewind/fast forward any less than 1 minute?

While using catchup...

If I set the skips to 1 minute, they work fine. If I set it to anything less than 1 minute than it just goes to the nearest minute, then doesn't go any further or back when trying to skip.

For example. If I have skips set at 30 seconds. I am currently 23:43 into the current programme. I press skip back (to jump back 30 seconds), but it goes to 23:00. I press skip back again and it stays at 23:00.

It does work going forward but only if its had a little buffer time first. So to skip a minute I could press forward once, wait a few seconds then press it again. Otherwise it would skip back to the last exact minute.

Any way to fix this? Happens with all my providers on all my devices with any connection.