One particular behavior that confuses me, is the following. I would expect to be able to write various signals to different memory cells, and that these would operate independantly from each other. However, with the following example:

clr
mov mem1[1], 1[item=iron-ore]
mov mem1[2], 2[item=iron-ore]

I see that subsequent writes of the same type, will empty the previously filled memory slots. So after the above code, memory bank 1 starts with an empty cell on index 1, and the value 2 on the second cell. This appears to work as expected for signals of different type, but why is it different for this scenario?