Xcellon 7-Port USB Hub Not Working Correctly on iMac

I bought this product (Xcellon 7-Port USB 3.0 Hub) from B&H a couple of weeks ago and for some reason I'm having mounting and connectivity issues while using a 24-inch Apple iMac M1 running Ventura 13.3.1(a). The unit will mount multiple drives but not all. The led indicator comes on to show that there are 5 drives plugged into the hub but only 3 of them will mount. If I eject those 3 mounted drives it still will not see the other two. There were also issues before with a single mounted drive where, after a 5+ hours of work I might try to access it via Finder and I would get the pinwheel, have to force restart Finder, then force a reboot as the entire system would hang. I have recently updated to Ventura but not until after I received and started using this product. The issues started in Monterey and I hoped upgrading to Ventura might fix them. NOW, if I plug the hub into my Macbook (14-inch, 2021, running Monterey 12.4) all five drives will mount and be available in Finder - no problem. I have tried moving the hub among the four USB-C ports on the back of the iMac with the same result. I would REALLY appreciate any ideas on what the issue might be.