Alarm Expires earlier than intended when using set

Question

1) Sample was used for repeating alarm.
2) setInexactRepeating(60000,60000), first one expires happens at 20 to 30 secs, rest ones expires in time i.e 60secs.
3) setInexactRepeating(1000 * 60 * 25,1000 * 60 * 25), first one expires happens at 10 to 14 mins~, rest ones expires in time i.e 25mins.
4) Docs says "Your alarm's first trigger will not be before the requested time".

Anyone experienced this before?using setExact/set and restart the alarm works well and setRepeating has problem too!