I went through the same thing (still do sometimes) with my DS when he was 3 - 4months old. The only thing I can say is that EASY is a guideline, if my ds only wants 45mins and he wakes and is happy and smiling then I am not going to upset him by try to put him back to sleep.
If however he wakes after 45mins still grumpy and whiney then I most definitely put him back with sush/pat and don't even lift him out the cot.
There are also days when I have to wake him after 2 hours nap
The short naps don't happen as much now he seems to take 2 long naps a day and a catnap before bathtime.
The main thing is don't get worried about it,
your not doing anything wrong and after reading many other posts the same, it is just something that happens at this age.
Also to just to add ..... are you leaving your LO time to try and resettle after waking froma a short nap or going to them?
see
https://babywhispererforums.com/index.php?topic=649.0