Stocks trading at strange increments

I've noticed a few strange things going on with some stocks, in that they are sometimes quoted to 3 or 4 decimal places even though they trade in pennies.

For example, on 6/23 here's a few data points that seem strange:
NYSE:NFG: Open: 58.045
NYSE:DAI: Open: 67.5514

AMEX:PBE: High 17.564
NYSE:CCK: High: 27.5575

AMEX:XLB: Low: 43.1801
AMEX:XLV: Low: 30.209

NASDAQ:IFGL: Close: 38.821
NASDAQ:NGA: Close: 8.852
NYSE: F (PR S): Close: 29.765

It seems that most web sites (yahoo, google finance etc.) round or truncate this date to two decimal places though...

It's different securities every day that exhibit this issue, so doesn't seem limited to certain securities.

Can anyone explain how/why these securities are trading at different increments to the rest of the market?
 
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