If the tuners are of good quality, they won't do that. Cheap tuners will do that.
even with a great and well made/maintained gear, there is always a chance that something could bind/slip/stretch/etc.
Tuning up to a pitch takes a lot of potential problems out of the equation. It's a good practice to have especially when using unfamiliar gear.
I should have been more clear in my original question. I did not mean tuning the instrument in general, but literally tuning an individual string up to the correct pitch. For example, if the string is sharp, I have read and have been told that you need to tune down past the correct pitch and then back up to said pitch.