I must be new to sports betting

[coolmoedee]

Hi guys, this one threw me for a loop yesterday so I wanted to know if you all agree. I had a parlay with the phillies and Florida yesterday in Baseball. I had both as "action". I guess the phillies changed their pitcher before the game started. I had the Phillies at -175 on my parlay, but when it was graded, they had the phillies at
-205. Can the sportsbook change the odds after the bet was already made? They told me because I chose "action" the odds can change if the pitcher changes. I thought once your bet was laid, you got the odds at the time of the bet? What if they threw in a rookie pitcher? Would I get the line at -120 instead of -175 even if at the time I placed the wager they were -175? I was under the impression that when your bet was placed, the odds (no matter what your betting on) were locked in? Am I wrong?