Strange execution seek answer

Need help to see if someone have answer for this:

example:
asking is 3.9
bid is 3.7
Trade 12:00:01pm 1000s @ 3.7
immediately a same quantity trade 12:00:01pm 1000s @ 3.8
Trade 12:30:01pm 2000s @ 3.7
immediately a same quantity trade 12:30:01pm 2000s @ 3.6
etc etc...

duplicate same quantity and same trading time but different
price...very
strange.

I heard of same price (double print), same qty and same time due to the computer
system program or maker matching delay. Never heard of different price.

Thank You
 
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