need help with parlay calculation

[gcd8]

just started using a local and did an open parlay i did a 4 team parlay and i realize now that's a big mistake because he is using las vegas payout on parlays only getting 10-1 instead of 12.28-1 like off shore but here's what i don't understand i hit the first three legs of parlay i have one more open spot

1st leg -105
2nd leg -130
3rd leg -145

the bet is for 300 so a standard 3 team parlay pays 6-1 and i went to the parlay calculator and right now i have

300-1450.93 if i just did a 3 teamer, now when i add the 4th in let's say i put in a big favorite -450 on the site he's using the parlay pays 300-1419 when i do on regular parlay calculator it pays 1840.02 but what i can't figure out
and i know it can't be right how can i be getting more money on a 3 team parlay than 4 team the 4 team parlay pays less than the 3 team by adding a -450 fav

[Louisvillekid1]

Some PPH sites are just set up with off brand parlay odds

[Tboonepickem]

yeah just remember running parlays with your local is equivalent to running a parlay with tony soprano. One way or another, he is going to win.

[gcd8]

even if they have the standard las vegas payouts a 3 team parlay can't pay out more than a 4 team parlay with the same teams involved i mean

-105
-130
-145

can't pay more than

-105
-130
-145
-450