I think because they see the "offset-pages" as the same.
You can see IT in this example of Googles report :
hond-aan-boord-stickers.asp aan boord.asp
+
/as​p/C​ata​_ho​nd aan boo​rd.​asp​?of​fse​t=8
/as​p/C​ata​_ho​nd aan boo​rd.​asp​?of​fse​t=16
/as​p/C​ata​_ho​nd aan boo​rd.​asp​?of​fse​t=2​4
/as​p/C​ata​_ho​nd aan boo​rd.​asp​?of​fse​t=32
/as​p/C​ata​_ho​nd aan boo​rd.​asp​?of​fse​t=40
/as​p/C​ata​_ho​nd aan boo​rd.​asp​?of​fse​t=48
/as​p/C​ata​_ho​nd aan boo​rd.​asp​?of​fse​t=56
......
The "offset-pages" does have the same title and description tags.