Board Thread:Bug Reports/@comment-29298192-20180512213131/@comment-34483122-20180512214049

thats not a glitch, you upgraded your zombies speed so he was permanantly sprinting. If you did not do that then it was because your zombie went ai due to you typing idle or you leaving for a long amount of time. When that happens it upgrades all 3 catagories at first but after that it just upgrades speed until your zombie gets to level 5 (I think) and it upgrades all 3 again