line moved while depositing

Saw a great line for the game tonight and tried to get my deposit in quick. By the time I got my funds through, the line had shifted by half a point against me. This isn’t the first time it’s happened either, and I’m starting to wonder if there’s a trick I’m missing or if I’m just slow on the draw. I try to prep everything before I commit, but still get burned. Curious how you all handle stuff like this because it’s testing my patience.