It adds up to your balance just fine. Its just rounding. On all bets it shows as won 1satoshi while u won like 0.5 satoshi. It cant show u won 0 coz u won bit more than that. And it cant show decimal places of satoshi coz it would be pointless and that doesnt exist. So it shows +1 satoshi. And ur balance adds up a fraction of satoshi but it cant show it.

But as u can see after 2-3 bets as soon as u have enough for full satoshi it will add it to ur balance.

On pd2 it was showing it on all bets as full satoshi , and on balance, and that was giving problems when trying to cashout all of ur balance while u dont actually have that last satoshi u are trying to cashout. So u wasnt able to cashout unless u cashout 1 satoshi less than ur balance. So here they gone for a bit different approach so u can always cashout ur full balance. And it will show 0.0000000 while u have 0.0000000.5 or so .

As for ur concern about bigger bets , it cant happen to any bets where winning is actually 1 satoshi or more . So u have nothing to worry about.
And u dont have nothing to worry about on this small bets to, coz it does everything as it should it just on all bets tab rounds up all winnings that are less than 1 satoshi to a full satoshi. Just to show u won something . While it adds up to ur balance that fraction it just doesnt show it until there is enough for full satoshi.

I hope i explained it to u well enough .

Im sure pd wouldnt try to false advertise u winning 1 satoshi while u win less than that , that would be huge marketing trick for sure Especially coz people that bet so huge amounts usually bet them from faucet which is pd money .