I got the Michelin jack stands to keep my car lifted up during my storage period. I put all 4 jacks but one of my rear jack would stand free and not get any weight on it, meaning only 3 jack stands are lifting my car..
is that normal? or is michelin jacks are screwed up or am i just on uneven surface?

 

Your on a uneven surface, put a block of wood on that one jack stand. Unless you didn't raise the stands to all the same height.

 

what i do is the same, i put a piece of wood under each uneven stand to hold the weight as evenly as possible to ensure so, kick each stand to make sure its tight,
this process is usually a bitch!

 

There is absolutely no reason to store your car on stands.

 

^i was just worried bout my tires.
i dont want it to sit there for 9 months.

 

So take them off and put on 4 spare tires.

 

i finally evened out
but will uneven weights on the jacks bend my chassis?

 

just store it on the wheels. i've done that for 10 years with my car now and never had an issue... sometimes the car has sat for 2 years at a time!