Just out of curiosity, can I ask; Is the primer crimped on this ammo?
Based on your description (and as others have already mentioned) this sounds like the round is not expanding. As such, I ask about the primer being crimped for a simple reason.
You may not have varmint ammo. It's not widely advertised, but Hornady supplies Law Enforcement with 55gr TAP Urban ammo, which looks like a VMAX, but has a much heavier jacket (primarily for penetration; clothing, heavy coats, etc.). I'm wondering if during the component shortage, some bullets got misloaded in the wrong production run with the wrong bullet. Or, they simply packaged TAP ammo as Varmint ammo by mistake (hence my asking about the primer being crimped).
I have no basis or proof of this, and this is merely conjecture on my part, but this sounds like it may be the case here.
Just a thought...
55 gr TAP URBAN® - Hornady Law Enforcement