I have also noticed about 2-3 psi variation between BP bunk vs Shell bunk, hence it is advisable to invest in a good quality pressure guage and manual air pump.

This I believe could happen even if you filled up at a local puncture shop. And it reminds of an incident that happened to me less than a year ago my duke.
I had as-usual filled fuel & air from the usual petrol bunk i visit, and after riding around 4 km (to a friends house) and parking the bike i felt a bit of heaviness in the front.. just ignored it and later after a couple of hours when I was leaving his apt, noticed that the front tire was flat.. now luck was on my side, I had just received the 'resqtech' tire inflator that evening and it was in my bag and so I got the opportunity to use it and fill up air till I get to a puncture shop (It was around 830 in the night). So I fill up with the resqtech (worked like a charm!) and rode to a 24/7 puncture guy and on checking he did not find any leak and i was confused. So the next morning I take a closer look at the tire (it still had not lost any air) and I notice a shiny object in the tire.. rush to the puncture guy and show him that.. turns out it was small metal chip embedded on surface, and not a puncture. Reluctantly I ride back home and try looking for a puncture but to no avail. Been many months now, and the tire never went flat or has had a puncture (in the 27k km now).
So yeah, it was probably a jammed valve which became ok when i inflated the tire using my portable inflator.
I wouldn't blame the petrol bunk for it, because it could happen anywhere (it's the same nozzle everyone uses). Most of all, petrol bunk guys have a more accurate meter and hence you can fill in to the correct pressure. The puncture guys usually eye ball it and always overfill.. the puncture guy i went to, ended up filling 40 psi on the front after he did not find any puncture !! Had to get it corrected at the petrol bunk.
I always prefer to fill up air at a petrol bunk than a road side puncture guy (these guys 99% of the time over fill the tires, and overfill excessively.). And any decent mechanic will also advice you to fill up at a petrol bunk. In fact some puncture guys are know to be more unscrupulous.

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Could be. But do you also know that riding the vehicle even for a few km ends up increasing the pressure inside by a few psi? (since tire gets warm).
That's y it's always better to get the tire pressure checked when cold and the reason why tires pressures are mentioned as 'cold' in the manufacturer recommendations.
Of-course if you have a good quality pressure gauge, check it yourself when the tire is cold (like after the bike has been sitting idlle overnight or over a few hours)

.. now luck was on my side, I had just received the 'resqtech' tire inflator that evening and it was in my bag and so I got the opportunity to use it and fill up air till I get to a puncture shop (It was around 830 in the night).

How you connect the resqtech tyre inflator to battery? have you done some jugaad or have a readymade charging point on your bike>

i think the valve being jammed or getting some other displacement of the pin, due to filling air at the petrol pump might be true as for the past month being noticing the same issue on bike too ever since i shifted to filling air at sarjapur BP pump instead of doing it on my own .

The pressure loss is very much evident so i will also get the valve checked up soon.