Different level of strategy in tiers, strange...

Ok: I play in two different accounts, in NA I'm silver 3, and in LAN I'm gold 2 (almost 1). I understand the differences about MMR, kda and those things, and can tell you that gold 2-ish is about the same skill level in both servers (although NA is a bit tougher). Ok now there is this problem I've encountered: In gold, I can play normally, have a decent sense of the game and a good skill level; I get good scores, win most matches and well its like I'ts the level I belong in. Now, I began playing in silver recently just to "boost it up" since I've been gold 2 on that account as well before, and to my surprise, the game level is completely different. When it comes to skill, I can notice a difference in the players (obviously worse in silver), but in decision making, its a whole different level. Let's say I roam somewhere, I get caught A LOT more than in gold, because players in this elo make completely different moves and you find them in different places. For example: lets say I go top to help a teammate, and to my surprise, a wild support (yeah wut) and jungler are in our jungle taking camps. I die. These strange tactics in Silver have made me die tons more, even though the skill level is lower. I was wondering what made these huge changes in strategy and stuff, becuase playing normally (no raging, afk'ing or feeding) in silver I get like a 0.3 kill/death ratio, while in higher gold I get around 2.0. Thanks for your time reading, have a treat: