No media unfortunately. It could be my end but its similar to a bug that I reported a while a go for taxi fare and it was fixed by an admin. Example: I slide the bar to $160 for all jobs but when I press done, it adjusts to $161.
I think it might be both. Its usually like this. You set a 10% Income Tax using the slider, click save and then the right after the value corrects itself from 10% to 11%. Most commonly happens when setting pay, Income Tax and increasing cars for cops, medics and FFs.
You can see that right before you hit Save it shows the value you set, but as soon as you hit Save it changes. For me it doesn't happen that often as I got used to just rewriting the salaries/taxes.