It is normal for the Cadenza series and that’s why I would never own one. It is simply a poor design to have the heel ride so close to the playing surface when properly set up. Try playing a warped record at 45 rpm and see if it makes repeated contact with the LP.
That is not normal behavior for Cadenza series. All of the Kontrapunkt, Cadenza, Jubilee, and Windfeld lines have that same design and none of them should hit the record (even on moderate warps) when properly setup UNLESS the cartridge in question is defective or damaged. I've had 7 of these cartridges now. If it's riding that low you need to contact Ortofon or the seller.
Only time I've seen a Cadenza hit the record was when it was mistakenly put on a Project Debut where the metal platter pulled on the cartridge magnet. Whoops!