Hi Kelly! It sounds like your oven might have a hot spot, since it seems to only be happening on one side. Doing a quick test of that (directions are in the blog linked above) should help find the most even-baking spot in your oven. Baking at 400°F is perfect. Often a crust will slide down if:

1. There was a bit too much moisture in the crust.

2.The crust wasn't cold enough when it went into the oven and the fat melted too quickly.

3. The oven wasn't hot enough.

We'd recommend checking for hot spots, then be sure to chill your crust in the fridge for at least 20 minutes, preferably longer, before baking, make sure your oven has preheated for a good 30 minutes, and try rotating the crust every 15 minutes or so to help it bake a little more evenly. We hope this helps! Annabelle@KAF

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