Yup I should have tested them separately my bad. I managed to remove the template node and test, still I get the same results , The value on the UI doesn't change unless I manually click the timestamp ( inject node ) to inject some value.
my node-red version is v12.19.0
UPDATE: I started over and created a new time stamp node and it fixed my issue, It seems the update interval was the problem. Thank you very much @Colin
Well that doesn't appear to be consistent with several of the earlier reports, but if it is fixed then ok, I guess we may never know what was actually going on.
true that, I checked it several times now, its working consistently. I remember doing an apt update of all packages before trying this out, not sure whether that fixed it. thanks anyways 
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