1/4 cpu heatsink pins doesnt lock in

[SgtCockroach]

I bought a new cpu heatsink 2 month ago and installed it , just opened up my case to clean my pc from dust. I noticed one of 4 heatsink pins is not locked but its put correctly in its place and the heatsink doesnt wiggle or somthing. I also tested with a stress test if the cpu gets overheated but everything seems fine. Its just that one pin which needs a bit of too much force to lock but im worried not to harm the mobo. Any advice ?Should i leave it like that bc the heatsink is still holding tight or should i do something?

Its the pin on the top left.

 

[evongugg]

I would get a new heatsink or try to find a pin replacement if it is damaged.

 

[vrumor]

Is the wire that is run across it keeping it from locking down? Weird wire management.

 

[SgtCockroach]

No its not the wire

 

[geofelt]

I would reseat the cooler.
Clean off the old paste and apply new.

The key to getting all pins through the motherboard and locked is to push down simultaneously on a diagonal pair.
If you push them singly in rotation, you will never get the cooler to lie flat.