Hi Nathan,
Welcome to our community! 
First of all, check the tilemap collider. Does it look like Rick’s or are there any gaps or squares?
Click the ‘Pause’ button, then the ‘Play’ button. Keep the Scene window open and zoom in on the enemy, which you select in the Hierarchy. Then click the third button on the right-handed side of the ‘Pause’ button. This way, you click through the frames.
Maybe the enemy collider is not set up correctly. When the enemy flips, none of its colliders is supposed to touch the vertical edge (the ‘wall’) again.
The periscope collider is too close to the circle collider. Please compare your enemy colliders to Rick’s.
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