History on bets that start out one team favored than drastically changes NOT being a huge public pick?

For instance this weeks Dallas Philly game started Dallas -3 and moved quickly to Philly -3

Few weeks ago Washington started -3 against Detroit and it moved to Detroit -1 and they covered by 7...

Now im not talking about huge moves due to huge public movement.. Like how when cincy started -1.5 vs New England and public pounded Pats and moved it to New england -2.5..

A lot of times i try and pound fishy lines because it works (yesterday my biggest bet was Mizzou and it paid), and this Philly line is the fishiest of the week, especially with public around 68% on the Cowgirls..

Does anyone have any insight on these line changes??

By the way my second fishiest line is GreenBay.. was thinking of 3 units on philly and 2 on GB.. already took carolina -6