Stupid 7-card stud question

[TxShadow]

I'm relatively new to 7-card stud (no one ever wants to play it ). I noticed on Pokerroom that there are 8 handed 7-card stud tables. I did a little math:

8 x 7 = 56
52 cards in a deck
56 - 52 = 4

How does this work??

[xDiamond_CutteRx]

If all players see 7th street, the last card is dealt face up as a community card.

[snoogins47]

That happens way more frequently than you would imagine...or at least, more than I initially imagined.

[wEbMaStEr]

I've yet to see it on anything with more than a .50/$1 limit tho