I’ve come across this – including an instance where one slider was fine but another apparently identical slider was not.
In one instance I’ve put 10% and 90% to reflect where the labels actually appear, instead of 0% and 100% as desired, though I like your arrow solution too.
The alternative (which I’ve also used) is separate text components for the labels – a pain but it works.
Is this one a known issue @sotiri ?
See also Slider Label Position