"Android is upgrading... starting applications" on every boot after 4.1.2 upgrade

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http://forums.androidcentral.com – Yesterday,I updated my gs3 to 4.1.2 using kies.I was rooted with chainfire's exynosabuse.apk but before I upgrade,I unrooted.Now, everytime I reboot I get the "android is upgrading" message.After searching for a while,it turned out that the system wipes dalvik cache on every boot but why is it happening ? I didn't have any root apps installed at the moment of upgrading except for exynosabuse which I also removed thinking it might solve the problem but it didn't. It doesn't bother me too much,only a 2 or 3 more secs in boot time but it is still kinda annoying and I'm not sure if this (HowTos)