FWIW:

I just got a new nerdqaxe++ in the mail today.

It came out of the box with a best share of 5.51m;  so this shows my seller runs them before sale.

I have it already up on ckpool.

It currently has a best share of 4.13m.

Odds are if it has a bigger share then you have ever seen since using it;  probably its from before you acquired it.

you are going to have to check the qaxe firmware docs on how to reset the BD variable if you wish to do so.