Analog Lab can only load one Analog Lab preset at a time. Analog Lab however does have Multipresets where two sounds can be played seperately, if one wish so.
Loading multiple instances of for different sounds is normal, no matter you use one or multiple controllers.
I can add, that in generel when using multitimbral plugins there is a choice to be made, also in example depending on how the use of the CPU in a DAW will turn out using either one instances with many instruments in it or using multiple instances with one instrument in each.