Great Question:
Part of it can be summed up these might have been pre time war Daleks, one reason being The Doctor was there are the birth of the Daleks and almost stopped them from beginning. However the first Doctor who know about the Daleks, but the Daleks he met did not know about him.
here is a simple time line of possibilities.
--1000 years prior Earth colonizes Skarro. (in one of the books, placed the year around 3000.)
Year 1000 after the nuclear war on Skaro Daveros creates the first Dalek. The 4th Doctor nearly stops the Daleks, the Daleks kill Daveros.
<--Place the "Asylum of the Daleks" episode here. 11th Doctor.
A few hundred years later The 1st Doctor and a Group of Humans encounter the Daleks, the Daleks have no knowlegde of the doctor.
Shortly after this the 2 and 3erd doctor have adventures besting the Daleks.
A few hundred years later the Daleks are in a war against the Movellan a Andriod race of Rastafarian-bots. 4th Doctor tries to stop the Daleks from reviving Daveros.
4th, 5th, 6th,7th doctor all beat the Daleks and Daveros. in one case Daveros invents the Imperial Daleks which use human heads, these Daleks where smarter and harder to beat.
8th Doctor receives the remains of the Master from the Daleks after the Daleks execute the Master.
-Mysterious time War between the Daleks and the Time Lords. Both races thought to be lost.
9th Doctor finds new Daleks made from Humans. Rose removes them from History.
10th Doctor finds original Daleks in the Void Sphere. the doctor sends all but 4 back to the void. One becomes a human Dalek hybrid, the other Daleks kill him, one survives to set a trap to destroy all the remaining Daleks.
11th Doctor Destroys the universe but reboots it with the Help of Amy Pond. (lost in old universe timeline were human Daleks from the 1940's UK, and the upgraded new Daleks.)
Granted Since the universe is rebooted, the Daleks might have been rebooted to the state prior to the time war, in which case .
<--Place the "Asylum of the Daleks" episode here.