Grocery / Sports Supplements category has been randomly gated, with no explanation.

In late December, we found all our listings had been hard gated. We were not notified of this and have been completely unable to find out why this has happened. We have been an Amazon seller for 9 years and have sold on this category on Amazon USA for nearly all that time. However we are still seeing lots of sellers on our old listings, based in the UK & USA, still selling. So we are very confused what makes us so different. Why are some sellers still allowed and some not. Example ASIN: B0B5TWQ9PN

PLEASE HELP.