I thought using Start11 and StartAllBack, would cause conflicts as they are both trying to re create a familiar Start menu from earlier Operating Systems, it sounds like they are both trying to do the same thing but in a slightly alternate way causing what you are seeing.
I am using both on a multi booting system, one SSD with StartAllBack, (which works best with themes) and a second with Start 11 alongside Explorer Patcher allowing me to use Windowblinds 10 working on Win 11, this way i can enjoy the benefits of both Programs with a re boot, just not both together. If you use Macrium Reflect to make a fully working clone of your existing Drive on a cheap small SSD, then using StartAllBack on one and start11 on the other, It's not a perfect solution, but running things like this does allow the use of both , but not together.