Quick Help Needed (in middle of build)

[DeadMetal17]

So Im building my friends PC, & im having problem attaching the cooler

1 x Intel Core i5-4690K 3.50GHz (Devil's Canyon) Socket LGA1150 Processor - Retail £169.99
1 x Corsair Hydro H105 Extreme Performance Liquid CPU Cooler (CW-9060016-WW ) £89.99
1 x Gigabyte Z97M-D3H Intel Z97 (Socket 1150) DDR3 Micro ATX Motherboard £79.99
1 x Corsair Carbide Series Air 240 High Airflow PC Case - Black (CC-9011070-WW) £69.95

I put in the adjustable backplate for 115x and put in the screws for a 115x but its not secure, once tightend I can still push the screws back moving the backplate away form the back of the mobo a good few mm (is that suppose to happen? ) please help

 

[DeadMetal17]

i can get the back plate through the holes np, but when i screw in as tight as possible (with all 4) i can still push the whole thing back so that the backplate is a good 4mm away from the board. the only thing I casn think of is that im using the wrong screws

the cooler came with 3 types (Im using the one that is circled red) is that right?

 

[DeadMetal17]

just watched a video now of someone installing it & looks loose for him to, will put on the block and hope that fixes everything

Edit: seems to be alright, panic over