You saved over old ones - that is the reason of the bug. A new game requires empty Saves directory to not meet this bug. This bug occurs if you have old saves from previous playing and saving over them.
Ликер, видимо он не о самой старой башне Ксардаса, а о пещере рядом с нежитью, где Авабюл.
some cave and place have no enemy and chest also empty. i went Fort Azgan and Undead cave by Old tower Xardas, there was no enemy and also all chest empty. what can i do?
What exactly Udead cave you mean, what quest by?
It can be cured by deleting the file of location in the save (a save consists of several files and one of them is a file of location, deleting the file of location generates a new file with all initial mobs and items). For example, such file of location for Azgan is Paladinford.zen, delete it and you`ll find the location in initial conditions.