Tyre wear

Just wondering if anyone knows if this is normal,
The rear Pirelli Diablo is loosing chunks on the leading edge of the
tread blocks, is it a suspension set up? (too much rearbound or compression) I am still playing with the Ohlins.
Hope the pix show it clearly.

The rear Pirelli Diablo is loosing chunks on the leading edge of the
tread blocks, is it a suspension set up? (too much rearbound or compression) I am still playing with the Ohlins.
Hope the pix show it clearly.