Why does the order of airline chart and general chart pages in Jeppesen charts differ according to chart types and airports?

Question

Why do the order of airline and normal pages in Jeppesen charts differ according to chart types and airports? For example, although the airline chart comes first and then the general chart in the ILS charts, the general chart comes first in the VOR charts, followed by the airline chart. Or, although the airline chart is listed first in the ILS section of the LTBU airport charts, the conventional charts are listed first in the ILS section of the LTBR airport charts.