[Gameplay] Outleveling bug.

I was playing Vi jungle, i clear 3 camps: Gromp, Blue, and Scuttle. Then i find a Xin Zhao in his jungle that cleared two camps: Krugs and Red. He gets to Level 3 while i was still level 2. We had same cs, at the time of fighting. How did i get out leveled? This has never happened before, usually by this point i get first blood, or force a flash, Literally did nothing different before the patch hit, and i won a fight as Vi versus a Xin Zhao in Patch 5.21 while both of us were level 2. How did this Xin Zhao get Level 3 at only two camps?

I have done the same camps of Krugs and then Red as Vi, and have never gotten to Level 3.

There was even a time i used Volibear, i went into enemy jungle at level 2, steal their cs, and find that a Yi with half my cs was still out-leveling me, when they only made one single appearance in lane for a possible gank (camped a bush for a bit, then retreats). I took his farm in red side, his red buff, but he still out leveled me at half my cs?

Before Patch 5.22 this has never happened before. Only now have i been noticing enemy junglers out level me for no real reason it seems.

This is getting weird fast. Has anyone else been having this issue?