Why do I suddenly feel like my heels are in a hole

I have been wearing Altra shoes for a good three or four years now. I wear them every day, including on 8+ mile hikes. I usually wear my old Provision 7s through the neighborhood for short runs and walks. I wear LP7s for hiking - I’ve had a couple pairs of those.

My second pair of LP7s finally got completely slick on the bottom so time for new ones. I decided to try the LP9s… why do I suddenly feel like my heel is lower than my forefoot? These feel totally different to me.

I tried the Timp5 and they’re too narrow. Experience Wild 2 were just weird. Helpppp.

I’ve tried Topos too and they’re too narrow ):