Took some time to convert the workbook to a worksheet, but actually it was quite useful.
The main issue was related to storing the load table values in a one-dimensioned Matrix. And here I'm getting a bit confused, because I couldn't reproduce the problem after fixing it.
Fixing in my case was to reset the loads, which reset the stored values in the Matrix that stores values between sessions.
When storing or reading values, I usually used storematrix[1,1] to do that. After converting to the worksheet I got an error message about out of boundary, so I could just use storematrix to save values, not storematrix[1,1].
I've run a test, and for storing values, storematrix is that same as storematrix[1,1]. When reading values again, it becomes different, as storematrix returns the value as a vector, while storematrix[1,1] actually gives the stored value.
During all of the test I checked the contents of the variables, and nothing looked suspicious. So right now I don't know what the reason of the problem actually is.