Resting heart beat is higher than during and after hard exercise?

For example. I get on the treadmill and I'm walking at a medium pace. My heart rate will be around 90-110bpm. I don't feel like it's hard at all, just warming up a little ready to run.
I usually about 5km around level 9 and inside this distance I will sometimes sprint for a minute and then go back down. The strange this is, that after running a couple of k's and I test my heart rate, it is down, sometimes to as low as 78. It decreases a lot. When I walk again to cool down, immediatly after the run my rate is around as low as when I'm running, then, can actually decrease futher to (the lowest I got last week) was 72 after 5 minutes after running. Sometimes if I test it again after about 15 minutes after running it will have increased again.
So odd.
I've tested this over and over on different machines in different gyms. The bpm differs but it always drops a lot during and straight after exercize.
I wander if the very chilled out and relaxed almost meditative state I feel after and during exercize has anything to do with it?? So strange. I've asked a few times but no one seems to be able to explain this.
Any ideas?
Am I a freak.
Am I wired back wards???
 
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