Why my Axis bridge mounting screws looks like this?

[sandiegoarea]

Hi guys.
I got an old Axis sport recently, it was made in 1997. When I opened the back cover, the bridge mounting screws are very strange. I can even see wood cracks created by screws, is this normal in Axis?

 

[sandiegoarea]

One more:

 

[threeminutesboy]

Looks similar on mine but nothing to worry about, I don't have the bad crack though

 

[Norrin Radd]

Normal