Dought & clear - How can sins happen in Ramadaan when the devils are chained up?

I heard the imam mention that the shaytan is not present inthe month
of Ramadhan. If this is truewhy is it hard for a muslim to stay away
from sins during the month of ramadan evenif the muslim is performing
his or her regular duties.
Praise be to Allaah.
Firstly:
The idea that the devils are not present in Ramadaan is not
correct.What is proven from the Prophet(peace and blessings of Allaah
be upon him) is that the devils are chained up during Ramadaan.
Al-Bukhaari (1899) and Muslim (1079) narrated from Abu Hurayrah (may
Allaah be pleased with him) that the Messenger of Allaah(peace and
blessings of Allaah be upon him) said: "When Ramadaan comes, the gates
of Paradise are opened, the gates of Hellare closed, and the devils
are chained up."
See question no. 39736.
Al-Qurtubi said:
If it is said, How come we see many evil actionsand sins happening in
Ramadaan? If the devils are chained up that would not happen.
The answer is that evil actions are reduced on the part of those who
fast meeting all the conditions of fasting andtaking care to observe
the proper etiquette; or that only some of the devils are chained up,
namely the maarids (strong ones), and not allof them, as it says in
some reports; or that evils are reduced in this month, which is
something noticeable – fewer evils happen in this month than in
others. If all of them were to be chained up that does not mean that
evil and sin would not happen, because there are other causes of evil
apart from the devils, such as evil souls, bad habits and human
devils.
FromFath al-Baari.
Shaykh Ibn 'Uthaymeen was asked inFataawa al-Siyaam(p. 466):
How can we reconcile between the idea that the devils are chained up
in Ramadaan and the fact the people commit sin?
He replied:
The fact that sin happensin Ramadaan does not contradict the report
that the devils are chained up in Ramadaan, because the fact that they
are chained up does not prevent them from moving. Hence it says in the
hadeeth: "And the strong devils are chained up, and they cannot
achieve what they usually achieve (at other times)." Narrated by
Ahmad, 7857; this hadeeth was mentioned by al-Albaani inDa'eef
al-Targheeb, 586; he said: it is da'eef jiddan (very weak).
It does not mean that the devils do not move at all, rather they can
move and lead people astray, but their activities during Ramadaan are
not like their activities at other times.