sliding

It sounds like you're running into a networking issue. We have an in-depth troubleshooting guide for networking and performance that should help with that. Check it out the steps here: http://support.kleientertainment.com/customer/en/portal/articles/1941750-network-and-performance-troubleshooting-guide

Further, you can remove client movement prediction if you're going to keep having latency issues:

http://steamcommunity.com/sharedfiles/filedetails/?id=367593872

I'd personally recommend turning off movement prediction under all circumstances, at least 'til the prediction portion's better.